diff --git a/webui/src/components/Log.vue b/webui/src/components/Log.vue
index d4ce06c..e8260c0 100644
--- a/webui/src/components/Log.vue
+++ b/webui/src/components/Log.vue
@@ -40,6 +40,7 @@ interface LogEntry {
 const logs = ref<LogEntry[]>([])
 const logContainer = ref<HTMLElement | null>(null)
 const expanded = ref(true)
+const lastTripRates = ref<number[]>([])
 
 const addLog = (level: LogEntry['level'], message: string) => {
   const now = new Date()
@@ -47,6 +48,13 @@ const addLog = (level: LogEntry['level'], message: string) => {
 
   logs.value.push({ level, time, message })
 
+  // 解析跳闸率数值
+  const match = message.match(/不同相跳闸率是\[([\d.\s]+)\]/)
+  if (match) {
+    const values = match[1].trim().split(/\s+/).map(Number)
+    lastTripRates.value = values
+  }
+
   // 自动滚动到底部
   nextTick(() => {
     if (logContainer.value) {
@@ -62,7 +70,8 @@ const clearLog = () => {
 // 暴露方法给父组件
 defineExpose({
   addLog,
-  clearLog
+  clearLog,
+  lastTripRates
 })
 </script>
 
diff --git a/webui/src/components/ParameterForm.vue b/webui/src/components/ParameterForm.vue
index 43664ca..82e98e8 100644
--- a/webui/src/components/ParameterForm.vue
+++ b/webui/src/components/ParameterForm.vue
@@ -381,17 +381,34 @@ const currentType = computed(() => {
   return params.parameter.rated_voltage.includes('±') ? 'DC' : 'AC'
 })
 
-// 当地闪密度大于 0 时，自动将雷暴日设为 -1，且不可编辑
-// 当地闪密度小于 0 时，自动将雷暴日设为 20，且可以编辑
-const isTdDisabled = computed(() => Number(params.advance.ng) > 0)
+// 雷暴日与地闪密度相互转换，公式：ng = 0.023 * td^3
+// 标志位避免循环更新
+let isUpdatingFromWatch = false
 
 watch(
   () => params.advance.ng,
   (newNg) => {
-    if (Number(newNg) > 0) {
-      params.parameter.td = -1
-    } else {
-      params.parameter.td = 20
+    if (isUpdatingFromWatch) return
+    const ng = Number(newNg)
+    if (ng > 0) {
+      isUpdatingFromWatch = true
+      // td = (ng / 0.023)^(1/1.3)
+      params.parameter.td = Math.round(Math.pow(ng / 0.023, 1/1.3) * 100) / 100
+      isUpdatingFromWatch = false
+    }
+  }
+)
+
+watch(
+  () => params.parameter.td,
+  (newTd) => {
+    if (isUpdatingFromWatch) return
+    const td = Number(newTd)
+    if (td > 0) {
+      isUpdatingFromWatch = true
+      // ng = 0.023 * td^1.3
+      params.advance.ng = Math.round(0.023 * Math.pow(td, 1.3) * 100) / 100
+      isUpdatingFromWatch = false
     }
   }
 )