diff --git a/README.md b/README.md
index 3720c6f..d0a064b 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,9 @@ help / clear / quit
 | `--transfers` | 4 | rclone 并行传输数 |
 | `--resume` / `--no-resume` | 开 | rsync 断点续传 |
 | `--checksum` | 关 | rsync 校验模式 |
-| `--verify` | 关 | 完成后校验（rsync -c dry-run, 0 差异=一致） |
+| `--verify` | 关 | 传输完成后校验（等级由 `--verify-level` 决定） |
+| `--verify-level` | slow | 校验等级: ultrafast/fast/normal/slow/full |
+| `--check-only` | 关 | 纯校验模式: 不传输, 仅按等级校验源/目标 |
 | `--retry` | 0 | 失败自动补传轮数, **-1 = 无限重试** |
 | `--smart-resume` | 关 | 智能续传: 校验目标最新N个文件, 损坏删除后从断点续传 |
 | `--smart-check` | 5 | 智能续传校验文件数 (<=100MB 全校验, 更大只查大小) |
@@ -91,6 +93,26 @@ help / clear / quit
 校验过程有**进度条**（总进度条复用）+ **单文件日志**（`校验 i/N: 文件名 ✓/✘ 损坏`），
 N 调大（如 50）也能实时看到校验进展。
 
+### 校验等级（`--verify-level`）
+
+| 等级 | 校验内容 | 188GB 耗时 | 适用 |
+|---|---|---|---|
+| `ultrafast` | 仅文件大小 | 秒级 | 快速健康检查 |
+| `fast` | 大小+mtime | ~1 分钟 | 常规检查 |
+| `normal` | 大小+mtime+最新N个md5 | 分钟级 | 兼顾速度与深度 |
+| `slow` | 全部文件 md5 | 40-60 分钟 | 全量可靠（默认） |
+| `full` | 全部md5+文件数对比 | 最慢 | 终极确认 |
+
+**纯校验模式（`--check-only`）**: 不传输，只按等级校验源/目标一致性，
+用于传输中断后快速确认已传数据是否完好:
+
+```bash
+# 快速检查已传数据（秒级）
+python3 transfer.py --mode cli --check-only --verify-level ultrafast /src/ /dst/
+# 全量校验已传数据（全部 md5）
+python3 transfer.py --mode cli --check-only --verify-level slow /src/ /dst/
+```
+
 > rsync 原子写（临时文件+rename）保证掉卡不会产生半截损坏的正式文件，
 > 残留临时文件由补传后的 `--verify` 流程发现处理。
 
diff --git a/tests/test_transfer.py b/tests/test_transfer.py
index 6185058..599bf6c 100644
--- a/tests/test_transfer.py
+++ b/tests/test_transfer.py
@@ -461,3 +461,66 @@ def test_verify_recent_callback_without_progress(tmp_path):
     (src / "a.txt").write_text("x")
     (dst / "a.txt").write_text("x")
     assert transfer.verify_recent_files(str(src), str(dst)) == []
+
+# ---------- 校验进度 (读取量轮询) ----------
+
+def test_read_proc_io_current_process():
+    """读取 /proc/self/io 的 read_bytes"""
+    val = transfer.read_proc_io(os.getpid())
+    assert isinstance(val, int)
+    assert val >= 0
+
+def test_read_proc_io_nonexistent_pid():
+    assert transfer.read_proc_io(99999999) == 0
+
+def test_collect_process_tree_self():
+    """自身进程无子进程时 = 自身 read_bytes"""
+    me = transfer.collect_process_tree_read_bytes(os.getpid())
+    assert isinstance(me, int) and me >= 0
+
+def test_collect_process_tree_with_child(tmp_path):
+    """进程树统计不报错, 返回合理值 (缓存命中时 read_bytes 可能为 0)"""
+    f = tmp_path / "data.bin"
+    f.write_bytes(b"x" * (4 * 1024 * 1024))
+    child = subprocess.Popen(["cat", str(f)], stdout=subprocess.DEVNULL,
+                             start_new_session=True)
+    time.sleep(0.5)
+    val = transfer.collect_process_tree_read_bytes(child.pid)
+    child.kill(); child.wait()
+    assert isinstance(val, int) and val >= 0
+
+# ---------- 校验等级 + 纯校验模式 ----------
+
+def test_parse_check_only():
+    args = transfer.parse_args(["--check-only", "s", "d"])
+    assert args.check_only is True
+
+def test_parse_verify_level_default():
+    assert transfer.parse_args(["s", "d"]).verify_level == "slow"
+    assert transfer.parse_args(["--check-only", "s", "d"]).verify_level == "slow"
+
+def test_parse_verify_level_values():
+    for lv in ("ultrafast", "fast", "normal", "slow", "full"):
+        args = transfer.parse_args(["--verify-level", lv, "s", "d"])
+        assert args.verify_level == lv
+
+def test_size_check_all_ok(tmp_path):
+    src = tmp_path / "s"; dst = tmp_path / "d"
+    src.mkdir(); dst.mkdir()
+    (src / "a.bin").write_bytes(b"x" * 1000)
+    (dst / "a.bin").write_bytes(b"x" * 1000)
+    assert transfer.size_check(str(src), str(dst)) == (0, 0)
+
+def test_size_check_detect_diff_and_missing(tmp_path):
+    src = tmp_path / "s"; dst = tmp_path / "d"
+    src.mkdir(); dst.mkdir()
+    (src / "a.bin").write_bytes(b"x" * 1000)
+    (dst / "a.bin").write_bytes(b"x" * 999)  # 大小不同
+    (src / "b.bin").write_bytes(b"y" * 100)
+    # b.bin 目标缺失
+    diff, miss = transfer.size_check(str(src), str(dst))
+    assert diff == 1 and miss == 1
+
+def test_verify_level_order():
+    """等级从快到慢的顺序固定"""
+    assert transfer.VERIFY_LEVELS == ["ultrafast", "fast", "normal", "slow", "full"]
diff --git a/transfer.py b/transfer.py
index 571bbb6..32428b1 100644
--- a/transfer.py
+++ b/transfer.py
@@ -142,6 +142,55 @@ def verify_recent_files(src_dir: str, dst_dir: str, check_count: int = 5,
     return bad
 
 
+VERIFY_LEVELS = ["ultrafast", "fast", "normal", "slow", "full"]
+
+
+def size_check(src_dir: str, dst_dir: str) -> tuple[int, int]:
+    """超快速校验: 仅比文件大小, 返回 (大小不一致数, 目标缺失数)"""
+    diff = miss = 0
+    for root, _dirs, files in os.walk(src_dir):
+        for name in files:
+            sp = os.path.join(root, name)
+            rel = os.path.relpath(sp, src_dir)
+            tp = os.path.join(dst_dir, rel)
+            if not os.path.isfile(tp):
+                miss += 1
+            elif os.path.getsize(sp) != os.path.getsize(tp):
+                diff += 1
+    return diff, miss
+
+
+def read_proc_io(pid: int) -> int:
+    """读取进程累计读字节数 (/proc/pid/io read_bytes)"""
+    try:
+        with open(f"/proc/{pid}/io", encoding="utf-8") as fh:
+            for line in fh:
+                if line.startswith("read_bytes"):
+                    return int(line.split()[1])
+    except (OSError, ValueError):
+        return 0
+    return 0
+
+
+def collect_process_tree_read_bytes(root_pid: int) -> int:
+    """统计进程树(含子进程)累计读取字节 (校验进度用, 避免统计无关进程)"""
+    pids: set[int] = {root_pid}
+    changed = True
+    while changed:
+        changed = False
+        for pid in list(pids):
+            try:
+                with open(f"/proc/{pid}/task/{pid}/children", encoding="utf-8") as fh:
+                    for child in fh.read().split():
+                        c = int(child)
+                        if c not in pids:
+                            pids.add(c)
+                            changed = True
+            except (OSError, ValueError):
+                pass
+    return sum(read_proc_io(pid) for pid in pids)
+
+
 def speed_stats(history) -> tuple[float, float, float]:
     """速度统计: (当前, 峰值, 平均) 字节/秒"""
     if not history:
@@ -196,6 +245,8 @@ class TransferConfig:
     retry: int = 0
     smart_resume: bool = False
     smart_check: int = 5
+    verify_level: str = "slow"
+    check_only: bool = False
 
 
 # ---------------------------------------------------------------- 输出解析器
@@ -504,7 +555,11 @@ def parse_args(argv: list[str] | None = None) -> argparse.Namespace:
     parser.add_argument("--checksum", action="store_true",
                         help="rsync 校验模式 (-c)")
     parser.add_argument("--verify", action="store_true",
-                        help="传输完成后校验 (-c)")
+                        help="传输完成后校验 (等级由 --verify-level 决定)")
+    parser.add_argument("--verify-level", choices=VERIFY_LEVELS, default="slow",
+                        help=f"校验等级: {VERIFY_LEVELS} (默认 slow 全量md5)")
+    parser.add_argument("--check-only", action="store_true",
+                        help="纯校验模式: 不传输, 仅按等级校验源/目标")
     parser.add_argument("--retry", type=int, default=0,
                         help="失败自动补传轮数 (-1=无限, 默认 0 不重试)")
     parser.add_argument("--smart-resume", action="store_true",
@@ -658,6 +713,13 @@ class TaskRunner:
     # -- 执行
     def run(self) -> int:
         """执行传输: 失败自动补传(retry) + 完成后校验(verify)"""
+        # 纯校验模式: 不传输, 直接按等级校验
+        if self.cfg.check_only:
+            self.lm.open_session(f"check_{os.path.basename(self.cfg.source.rstrip('/'))}")
+            self.lm.write(f"cmd: check-only level={self.cfg.verify_level}")
+            self.lm.write(f"mode: {self.cfg.source} -> {self.cfg.dest}")
+            self._verify()
+            return 0
         rc = 0
         attempt = 0
         retry_label = "∞" if self.cfg.retry < 0 else str(self.cfg.retry)
@@ -784,17 +846,71 @@ class TaskRunner:
                             f"({self.stats.pct:.0f}%) {human_speed(self.stats.speed_bps)}")
 
     def _verify(self) -> None:
-        """完成后校验: rsync -c --dry-run, 统计差异"""
-        self.lm.write("verify: 开始校验 (-c dry-run)")
+        """按等级校验源/目标一致性"""
+        level = self.cfg.verify_level
+        self.lm.write(f"verify: 开始校验 level={level}")
         if self.on_log:
-            self.on_log("[cyan]校验中 (rsync -c --dry-run)...[/]")
-        cmd = RsyncBackend.build_verify_cmd(self.cfg.source, self.cfg.dest,
-                                            self.cfg.bwlimit)
+            self.on_log(f"[cyan]校验中 (level={level})...[/]")
+        if level == "ultrafast":
+            self._verify_size_only()
+            return
+        if level == "normal":
+            self._verify_fast()
+            # normal: 追加最新 N 个文件 md5
+            src_dir = self.cfg.source.rstrip("/")
+            dst_dir = self.cfg.dest.rstrip("/")
+            n = self.cfg.smart_check or 20
+            self.lm.write(f"verify(normal): 追加校验最新 {n} 个文件 md5")
+            bad = verify_recent_files(src_dir, dst_dir, n)
+            if bad:
+                self.lm.write(f"verify(normal): {len(bad)} 个文件损坏: {bad}")
+            if self.on_log:
+                if bad:
+                    self.on_log(f"[red]校验发现 {len(bad)} 个文件损坏[/]")
+                else:
+                    self.on_log("[green]✔ 最新文件 md5 校验通过[/]")
+            return
+        if level == "full":
+            self._verify_slow()
+            # full: 追加文件数对比
+            src_dir = self.cfg.source.rstrip("/")
+            dst_dir = self.cfg.dest.rstrip("/")
+            ns, nd = count_files(src_dir), count_files(dst_dir)
+            self.lm.write(f"verify(full): 文件数 源={ns} 目标={nd}")
+            if self.on_log:
+                if ns == nd:
+                    self.on_log("[green]✔ 文件数一致[/]")
+                else:
+                    self.on_log(f"[red]✘ 文件数不一致: 源 {ns} vs 目标 {nd}[/]")
+            return
+        # fast / slow 共用 rsync --dry-run (fast 无 -c, slow 有 -c)
+        self._verify_rsync(checksum=(level == "slow"))
+
+    def _verify_size_only(self) -> None:
+        """ultrafast: 仅比大小"""
+        src_dir = self.cfg.source.rstrip("/")
+        dst_dir = self.cfg.dest.rstrip("/")
+        diff, miss = size_check(src_dir, dst_dir)
+        self.lm.write(f"verify(ultrafast): 大小不一致={diff} 缺失={miss}")
+        if self.on_log:
+            if diff == 0 and miss == 0:
+                self.on_log("[green]✔ 校验通过: 大小全部一致[/]")
+            else:
+                self.on_log(f"[red]✘ 大小不一致 {diff}, 缺失 {miss}[/]")
+
+    def _verify_fast(self) -> None:
+        """fast: rsync --dry-run 无 -c (size+mtime)"""
+        src_dir = self.cfg.source.rstrip("/")
+        dst_dir = self.cfg.dest.rstrip("/")
+        cmd = ["rsync", "-a", "--dry-run", "--out-format=%i|%n"]
+        if self.cfg.bwlimit:
+            cmd += [f"--bwlimit={self.cfg.bwlimit}"]
+        cmd += [src_dir + "/", dst_dir + "/"]
         try:
             proc = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                                     stderr=subprocess.STDOUT, text=True)
         except OSError as exc:
-            self.lm.write_error(f"verify: 启动失败 {exc}")
+            self.lm.write_error(f"verify(fast): 启动失败 {exc}")
             return
         assert proc.stdout is not None
         diffs = 0
@@ -805,6 +921,64 @@ class TaskRunner:
             diffs += 1
             self.lm.write(f"verify diff: {line}")
         rc = proc.wait()
+        self.lm.write(f"verify(fast): 完成 rc={rc} 差异={diffs}")
+        if self.on_log:
+            if diffs == 0 and rc == 0:
+                self.on_log("[green]✔ 校验通过: 无差异 (size+mtime)[/]")
+            else:
+                self.on_log(f"[red]✘ 发现 {diffs} 个差异[/]")
+
+    def _verify_rsync(self, checksum: bool) -> None:
+        """slow(rsync -c)/fast 共用: dry-run 差异统计 + 进度轮询"""
+        self.lm.write(f"verify: 开始 ({'checksum' if checksum else 'size+mtime'})")
+        if self.on_log:
+            self.on_log("[cyan]校验中 (rsync -c --dry-run)...[/]")
+        cmd = RsyncBackend.build_verify_cmd(self.cfg.source, self.cfg.dest,
+                                            self.cfg.bwlimit)
+        try:
+            proc = subprocess.Popen(cmd, stdout=subprocess.PIPE,
+                                    stderr=subprocess.STDOUT, text=True)
+        except OSError as exc:
+            self.lm.write_error(f"verify: 启动失败 {exc}")
+            return
+        # 进度轮询: 校验读取量 = 源+目标各读一遍 (2x), 按 /proc/io 统计
+        total_read = self.total_bytes * 2 if self.total_bytes else 0
+        stop_poll = threading.Event()
+
+        def poll_verify() -> None:
+            last = 0
+            last_t = time.time()
+            while not stop_poll.is_set():
+                time.sleep(1)
+                done = collect_process_tree_read_bytes(proc.pid)
+                now = time.time()
+                speed = max(0, (done - last) / max(0.1, now - last_t))
+                last, last_t = done, now
+                self.stats.bytes_done = done
+                self.stats.bytes_total = total_read or done
+                if total_read:
+                    self.stats.pct = min(100.0, done / total_read * 100)
+                self.stats.speed_bps = speed
+                self._emit_stats()
+                if self.on_log:
+                    label = (f"校验 {self.stats.pct:.0f}% 已读 "
+                             f"{human_size(done)}/{human_size(total_read)} "
+                             f"{human_speed(speed)}") if total_read else                             f"校验中 已读 {human_size(done)} {human_speed(speed)}"
+                    self.on_log(label)
+
+        poll_thread = threading.Thread(target=poll_verify, daemon=True)
+        poll_thread.start()
+        assert proc.stdout is not None
+        diffs = 0
+        for line in proc.stdout:
+            line = line.rstrip()
+            if not line or line.startswith(("sending", "sent ", "total ")):
+                continue
+            diffs += 1
+            self.lm.write(f"verify diff: {line}")
+        rc = proc.wait()
+        stop_poll.set()
+        poll_thread.join(timeout=2)
         self.lm.write(f"verify: 完成 rc={rc} 差异文件={diffs}")
         if self.on_log:
             if diffs == 0 and rc == 0:
@@ -812,6 +986,10 @@ class TaskRunner:
             else:
                 self.on_log(f"[red]✘ 校验发现 {diffs} 个差异 (rc={rc})[/]")
 
+    def _verify_slow(self) -> None:
+        """slow: rsync -c --dry-run 全量 md5 + 进度轮询"""
+        self._verify_rsync(checksum=True)
+
     def pause(self) -> None:
         """暂停: SIGSTOP 整个进程组"""
         if self._paused:
@@ -1109,6 +1287,7 @@ class TransferApp(App):
             resume=args.resume, checksum=args.checksum, verify=args.verify,
             logdir=self.logdir, policy=args.policy, retry=args.retry,
             smart_resume=args.smart_resume, smart_check=args.smart_check,
+            verify_level=args.verify_level, check_only=args.check_only,
         )
         if cfg.policy == "ask" and cfg.backend == "rsync":
             self._flash("[yellow]预扫描冲突...[/]")
@@ -1275,7 +1454,9 @@ def main() -> int:
                                  logdir=args.logdir, policy=args.policy,
                                  retry=args.retry,
                                  smart_resume=args.smart_resume,
-                                 smart_check=args.smart_check)
+                                 smart_check=args.smart_check,
+                                 verify_level=args.verify_level,
+                                 check_only=args.check_only)
         TransferApp(preset=cfg, logdir=args.logdir, keep_logs=args.keep_logs).run()
         return 0
     cfg = TransferConfig(source=args.source, dest=args.dest,
@@ -1285,7 +1466,9 @@ def main() -> int:
                          logdir=args.logdir, policy=args.policy,
                          retry=args.retry,
                          smart_resume=args.smart_resume,
-                         smart_check=args.smart_check)
+                         smart_check=args.smart_check,
+                         verify_level=args.verify_level,
+                         check_only=args.check_only)
     return run_cli(cfg, args)