diff --git a/simple_analysis/templates/simple_analysis/simple_analysis.html b/simple_analysis/templates/simple_analysis/simple_analysis.html
index a4b6d69..ca1be5d 100644
--- a/simple_analysis/templates/simple_analysis/simple_analysis.html
+++ b/simple_analysis/templates/simple_analysis/simple_analysis.html
@@ -2672,7 +2672,7 @@ function loadTrafficData() {
         document.getElementById('saTrafficSlider').value = 0;
         document.getElementById('saTrafficInfo').textContent =
             (d.windows||[]).length + ' 窗口 · ' + Object.keys(d.nodes_coords||{}).length + ' 节点 · 跨度' + ((maxTs-minTs)/60).toFixed(0) + 'min';
-        SA.map.off('moveend.flowCache').on('moveend.flowCache', () => { _trafficEdgeCache = {}; });
+        SA.map.off('moveend.flowCache').on('moveend.flowCache', () => { _trafficEdgeCache = {}; if (_trafficPlaying) renderTrafficCrossfade(); });
         document.getElementById('saTrafficTime').textContent = tsToBJ(_trafficCurrentTime);
         trafficStart();
     })