diff --git a/public/index.html b/public/index.html
index 6f05d81..8f99555 100644
--- a/public/index.html
+++ b/public/index.html
@@ -16,8 +16,8 @@
 
     <script>
         window.readVcdFile = async () => {
-            let inputVcdFile = 'test.vcd';
-            let inputViewFile = 'test.view';
+            let inputVcdFile = 'basic_tb.vcd';
+            let inputViewFile = 'basic_tb.view';
             const response = await fetch(inputVcdFile);
             const arrayBuffer = await response.arrayBuffer();            
             return [arrayBuffer, inputVcdFile, inputViewFile];
diff --git a/src/App.vue b/src/App.vue
index 04aa5c1..dc3559a 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -99,7 +99,8 @@ onMounted(async () => {
         globalLookup.t0 = vcdInfo.t0 || 0;
 
         globalLookup.tgcd = workerVars.tgcd;
-        globalLookup.time = workerVars.time;
+        globalLookup.time = workerVars.time;        
+        globalLookup.maxTime = globalLookup.time * globalLookup.tgcd;
         globalLookup.chango = signalValues;
         makeWaveView();
 
diff --git a/src/hook/wave-view/x-offset-update.js b/src/hook/wave-view/x-offset-update.js
index db0f839..66862a5 100644
--- a/src/hook/wave-view/x-offset-update.js
+++ b/src/hook/wave-view/x-offset-update.js
@@ -1,11 +1,14 @@
+import { globalLookup } from "../global";
+
 const xOffsetUpdate = (pstate, nextOffsetXFn) => {
     let nextOffsetX = nextOffsetXFn();
     const { width, xOffset, xScale, time, sidebarWidth } = pstate;
+    const maxTime = globalLookup.maxTime;
 
-    const maxOffsetX = width + xScale * time * 1.0;                // maximum offset
+    const maxOffsetX = width + xScale * maxTime * 1.0;                // maximum offset
     nextOffsetX = Math.min(nextOffsetX, maxOffsetX);
 
-    const minOffsetX = - width - xScale * time * 1.2;              // minimum offset
+    const minOffsetX = - width - xScale * maxTime * 1.0;              // minimum offset
     nextOffsetX = Math.max(nextOffsetX, minOffsetX);
 
     // 检测 0 是否超出了左侧的 --sidebar-width 的位置