diff --git a/webui/src/components/ParameterForm.vue b/webui/src/components/ParameterForm.vue
index 208718a..f84a3ed 100644
--- a/webui/src/components/ParameterForm.vue
+++ b/webui/src/components/ParameterForm.vue
@@ -26,12 +26,11 @@
               <q-card-section>
                 <div class="row q-col-gutter-md">
                   <div class="col-12 col-md-6">
-                    <q-input
+                    <q-select
                       v-model="params.parameter.rated_voltage"
-                      type="number"
+                      :options="voltageOptions"
                       label="额定电压等级 (kV)"
                       hint="输电线路的额定电压"
-                      :rules="[val => val > 0 || '必须大于0']"
                     />
                   </div>
                   <div class="col-12 col-md-6">
@@ -313,7 +312,7 @@ import LogComponent from './Log.vue'
 // 默认参数
 const defaultParams: AllParameters = {
   parameter: {
-    rated_voltage: 750,
+    rated_voltage: '500kV',
     h_c_sag: 14.43,
     h_g_sag: 11.67,
     insulator_c_len: 7.02,
@@ -342,6 +341,11 @@ const result = ref<string | null>(null)
 const error = ref<string | null>(null)
 const logRef = ref<InstanceType<typeof LogComponent> | null>(null)
 
+const voltageOptions = [
+  '110kV', '220kV', '330kV', '500kV', '750kV','1000kV',
+  '±500kV', '±660kV', '±800kV', '±1100kV'
+]
+
 // 数组操作函数
 const addHArm = () => {
   const last = params.parameter.h_arm[params.parameter.h_arm.length - 1] || 100
diff --git a/webui/src/types/index.ts b/webui/src/types/index.ts
index 03576e1..18d6553 100644
--- a/webui/src/types/index.ts
+++ b/webui/src/types/index.ts
@@ -2,7 +2,7 @@
 
 export interface Parameter {
   // 基本参数
-  rated_voltage: number        // 额定电压等级 (kV)
+  rated_voltage: string        // 额定电压等级 (kV)
   h_c_sag: number              // 导线弧垂 (m)
   h_g_sag: number              // 地线弧垂 (m)
   insulator_c_len: number      // 导线串子绝缘长度 (m)
diff --git a/webview_app.py b/webview_app.py
index 0df6908..165ad74 100644
--- a/webview_app.py
+++ b/webview_app.py
@@ -101,7 +101,9 @@ class EGMWebApp:
             ]
             para.h_arm = list(parameter_data.get('h_arm', [150, 130]))
             para.altitude = int(parameter_data.get('altitude', 1000))
-            para.rated_voltage = float(parameter_data.get('rated_voltage', 750))
+            # 解析电压等级字符串，如 "500kV" -> 500
+            rated_voltage_str = str(parameter_data.get('rated_voltage', '500kV'))
+            para.rated_voltage = float(rated_voltage_str.replace('kV', '').replace('±', ''))
 
             para.ng = float(advance_data.get('ng', -1))
             para.Ip_a = float(advance_data.get('Ip_a', -1))