diff --git a/core.py b/core.py
index 23726c1..6c40479 100644
--- a/core.py
+++ b/core.py
@@ -26,6 +26,8 @@ class Parameter:
     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"
+    z_0: float  # 雷电波阻抗，默认 300
+    z_c: float  # 导线波阻抗，默认 251
 
 
 def rg_line_function_factory(_rg, ground_angel):  # 返回一个地面捕雷线的直线方程
@@ -185,7 +187,7 @@ def solve_circle_line_intersection(
         return [_x, _y]
 
 
-def min_i(string_len, u_ph, altitude: float = 0):
+def min_i(string_len, u_ph, altitude: float = 0, z_0: float = 300, z_c: float = 251):
     # 海拔修正
     if altitude > 1000:
         k_a = math.exp((altitude - 1000) / 8150)  # 气隙海拔修正
@@ -196,8 +198,6 @@ def min_i(string_len, u_ph, altitude: float = 0):
     # u_50 = 1 / k_a * (477 * string_len + 99)  # 串放电路径 2000m海拔
     # u_50 = 615 * string_len  # 导线对塔身放电 1000m海拔
     # u_50= 263.32647401+533.90081562*string_len
-    z_0 = 300  # 雷电波阻抗
-    z_c = 251  # 导线波阻抗
     # 新版大手册公式 3-277
     r = (u_50 + 2 * z_0 / (2 * z_0 + z_c) * u_ph) * (2 * z_0 + z_c) / (z_0 * z_c)
     # r = 2 * (u_50 - u_ph) / z_c
diff --git a/main.py b/main.py
index 22f5bde..6f8bf75 100644
--- a/main.py
+++ b/main.py
@@ -170,7 +170,7 @@ def run_egm(para: Parameter, animation=None) -> dict:
                 insulator_c_len = para.insulator_c_len
                 # i_min = min_i(insulator_c_len, u_ph / 1.732)
                 # TODO 需要考虑交、直流
-                i_min = min_i(insulator_c_len, u_ph, para.altitude)
+                i_min = min_i(insulator_c_len, u_ph, para.altitude, para.z_0, para.z_c)
                 _min_i = i_min  # 尝试的最小电流
                 _max_i = para.max_i  # 尝试的最大电流
                 # cad.draw(i_min, u_ph, rs_x, rs_y, rc_x, rc_y, rg_x, rg_y, rg_type, 2)
diff --git a/webui/src/components/ParameterForm.vue b/webui/src/components/ParameterForm.vue
index 843853f..ff58fee 100644
--- a/webui/src/components/ParameterForm.vue
+++ b/webui/src/components/ParameterForm.vue
@@ -109,6 +109,24 @@
                       <q-tooltip>一年中雷暴天数，用于计算地闪密度</q-tooltip>
                     </q-input>
                   </div>
+                  <div class="col-12 col-md-6">
+                    <q-input
+                      v-model="params.parameter.z_0"
+                      type="number"
+                      label="雷电波阻抗 (Ω)"
+                    >
+                      <q-tooltip>雷电波阻抗，用于计算最小雷电流。</q-tooltip>
+                    </q-input>
+                  </div>
+                  <div class="col-12 col-md-6">
+                    <q-input
+                      v-model="params.parameter.z_c"
+                      type="number"
+                      label="导线波阻抗 (Ω)"
+                    >
+                      <q-tooltip>导线波阻抗，用于计算最小雷电流。</q-tooltip>
+                    </q-input>
+                  </div>
                 </div>
 
                 <!-- 导、地线挂点高度 -->
@@ -380,7 +398,9 @@ const defaultParams: AllParameters = {
     gc_x: [17.9, 17],
     ground_angels: [0],
     altitude: 1000,
-    td: 20
+    td: 20,
+    z_0: 300,
+    z_c: 251
   },
   advance: {
     ng: -1,
diff --git a/webui/src/types/index.ts b/webui/src/types/index.ts
index 414c950..6f022ca 100644
--- a/webui/src/types/index.ts
+++ b/webui/src/types/index.ts
@@ -14,6 +14,8 @@ export interface Parameter {
   ground_angels: number[]      // 地面倾角 (°)
   altitude: number             // 海拔高度 (m)
   td: number                   // 雷暴日 (d)
+  z_0: number                  // 雷电波阻抗 (Ω)，默认 300
+  z_c: number                  // 导线波阻抗 (Ω)，默认 251
 }
 
 export interface AdvanceParameter {
diff --git a/webview_app.py b/webview_app.py
index 021c19b..19249e3 100644
--- a/webview_app.py
+++ b/webview_app.py
@@ -332,6 +332,8 @@ class EGMWebApp:
 
             para.voltage_n = int(optional_data.get('voltage_n', 3))
             para.max_i = float(optional_data.get('max_i', 200))
+            para.z_0 = float(parameter_data.get('z_0', 300))
+            para.z_c = float(parameter_data.get('z_c', 251))
 
             # 设置 ac_or_dc 参数
             ac_or_dc_value = str(parameter_data.get('ac_or_dc', 'AC'))