diff --git a/core.py b/core.py
index 31d6119..0a63ee8 100644
--- a/core.py
+++ b/core.py
@@ -25,6 +25,7 @@ class Parameter:
     ng: float  # 地闪密度  次/(每平方公里·每年)
     Ip_a: float  # 概率密度曲线系数a
     Ip_b: float  # 概率密度曲线系数b
+    ac_or_dc: str  # 交流或直流标识，"AC" 或 "DC"，默认 "AC"
 
 
 para = Parameter()
diff --git a/main.py b/main.py
index ae3a3e3..2de9164 100644
--- a/main.py
+++ b/main.py
@@ -50,6 +50,7 @@ def read_parameter(toml_file_path):
         para.h_arm = toml_parameter["h_arm"]
         para.altitude = toml_parameter["altitude"]
         para.rated_voltage = toml_parameter["rated_voltage"]
+        para.ac_or_dc = toml_parameter.get("ac_or_dc", "AC")  # 交流或直流标识，默认AC
         toml_advance = toml_dict["advance"]
         para.ng = toml_advance["ng"]  # 地闪密度
         para.Ip_a = toml_advance["Ip_a"]  # 概率密度曲线系数a
diff --git a/webui/src/components/ParameterForm.vue b/webui/src/components/ParameterForm.vue
index 4812b90..3ea9a94 100644
--- a/webui/src/components/ParameterForm.vue
+++ b/webui/src/components/ParameterForm.vue
@@ -32,6 +32,15 @@
                       label="额定电压等级 (kV)"
                     />
                   </div>
+                  <div class="col-12 col-md-6">
+                    <q-input
+                      :model-value="currentType"
+                      label="电流类型"
+                      readonly
+                    >
+                      <q-tooltip>交流(AC)或直流(DC)，由电压等级自动判断</q-tooltip>
+                    </q-input>
+                  </div>
                   <div class="col-12 col-md-6">
                     <q-input
                       v-model="params.parameter.h_c_sag"
@@ -308,7 +317,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, reactive } from 'vue'
+import { ref, reactive, computed } from 'vue'
 import type { AllParameters } from '@/types'
 import LogComponent from './Log.vue'
 
@@ -316,6 +325,7 @@ import LogComponent from './Log.vue'
 const defaultParams: AllParameters = {
   parameter: {
     rated_voltage: '500kV',
+    ac_or_dc: 'AC',
     h_c_sag: 14.43,
     h_g_sag: 11.67,
     insulator_c_len: 7.02,
@@ -349,6 +359,11 @@ const voltageOptions = [
   '±500kV', '±660kV', '±800kV', '±1100kV'
 ]
 
+// 根据电压等级自动判断交流/直流
+const currentType = computed(() => {
+  return params.parameter.rated_voltage.includes('±') ? 'DC' : 'AC'
+})
+
 // 数组操作函数（最多3条导线，即数组最多4个元素：1地线+3导线）
 // 两个数组同步增减
 const addHArm = () => {
diff --git a/webui/src/types/index.ts b/webui/src/types/index.ts
index 18d6553..414c950 100644
--- a/webui/src/types/index.ts
+++ b/webui/src/types/index.ts
@@ -3,6 +3,7 @@
 export interface Parameter {
   // 基本参数
   rated_voltage: string        // 额定电压等级 (kV)
+  ac_or_dc: string             // 交流或直流标识，"AC" 或 "DC"
   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)