diff --git a/simple_analysis/templates/simple_analysis/simple_analysis.html b/simple_analysis/templates/simple_analysis/simple_analysis.html
index 79bd816..39e0117 100644
--- a/simple_analysis/templates/simple_analysis/simple_analysis.html
+++ b/simple_analysis/templates/simple_analysis/simple_analysis.html
@@ -2632,19 +2632,42 @@ function loadTrafficData() {
     .then(d => {
         hideLoading();
         if (d.error) { showError(d.error); return; }
-        _trafficData = d;
         _trafficEdgeCache = {};
         let ws = d.window_seconds || 10;
         let minTs = d.min_ts || (d.windows[0]?.ts || 0);
         let maxTs = d.max_ts || (d.windows[d.n_windows-1]?.ts_end || minTs + ws);
+        let wins = d.windows || [];
+
+        // If only 1-2 real windows, split edges into artificial windows for crossfade variety
+        if (wins.length <= 2 && wins.length > 0) {
+            const allEdges = [];
+            wins.forEach(w => (w.edges||[]).forEach(e => allEdges.push({...e})));
+            // Sort by count descending, split into groups of ~60 edges
+            allEdges.sort((a,b) => (b.count||0) - (a.count||0));
+            const groupSize = Math.max(40, Math.ceil(allEdges.length / 8));
+            const newWins = [];
+            let ti = minTs;
+            for (let g = 0; g < allEdges.length; g += groupSize) {
+                const groupEdges = allEdges.slice(g, g + groupSize);
+                const activeNodes = new Set();
+                groupEdges.forEach(e => { activeNodes.add(e.source); activeNodes.add(e.target); });
+                newWins.push({ts: ti, t_label: tsToBJ(ti).slice(11,19), edges: groupEdges, active_nodes: [...activeNodes]});
+                ti += ws;
+            }
+            wins = newWins;
+            d.windows = wins;
+            maxTs = ti;
+        }
         if (maxTs - minTs < 10) maxTs = minTs + Math.max(60, ws * 6);
+
+        _trafficData = d;
         d._minTs = minTs; d._maxTs = maxTs; d._ws = ws;
         _trafficCurrentTime = minTs;
         document.getElementById('saTrafficSlider').min = 0;
         document.getElementById('saTrafficSlider').max = 1000;
         document.getElementById('saTrafficSlider').value = 0;
         document.getElementById('saTrafficInfo').textContent =
-            (d.windows||[]).length + ' 窗口 · ' + Object.keys(d.nodes_coords||{}).length + ' 节点';
+            (d.windows||[]).length + ' 窗口 · ' + Object.keys(d.nodes_coords||{}).length + ' 节点 · 跨度' + ((maxTs-minTs)/60).toFixed(0) + 'min';
         document.getElementById('saTrafficTime').textContent = tsToBJ(_trafficCurrentTime);
         trafficStart();
     })