diff --git a/plugins/sentinel/dashboard.html b/plugins/sentinel/dashboard.html
index cea2964..29e4fd5 100644
--- a/plugins/sentinel/dashboard.html
+++ b/plugins/sentinel/dashboard.html
@@ -321,7 +321,16 @@
           }
           grid.appendChild(card);
           _cardCache[id] = card;
-          if (isRow && !_chartInstances[id]) {
+          if (isRow) {
+            // 销毁旧图表实例
+            if (_chartInstances[id]) {
+              ['cpu','mem','net'].forEach(function(k){
+                if (_chartInstances[id][k] && _chartInstances[id][k].canvas) {
+                  var c = _chartInstances[id][k].canvas;
+                  c.getContext('2d').clearRect(0,0,c.width,c.height);
+                }
+              });
+            }
             try {
               _chartInstances[id] = { cpu: null, mem: null, net: null };
               if (typeof MiniChart !== 'undefined') {
@@ -331,7 +340,6 @@
                 _chartInstances[id].net = new DualLineChart(id+'-net', '#bb9af7', '#c0a8f0');
                 
               }
-            } catch(e) {}
           }
         }
 
@@ -374,7 +382,6 @@
               if (charts.cpu) charts.cpu.update(cpuVal);
               if (charts.mem) charts.mem.update(memVal);
               if (charts.net) { charts.net.update(net.rx_bytes_sec||0, net.tx_bytes_sec||0); if (charts.net.maxVal < 102400) charts.net.maxVal = 102400; }
-            } catch(e) {}
           }
           // 更新额外指标
           var loadEl = card.querySelector('.load-val');