diff --git a/webui/src/components/ParameterForm.vue b/webui/src/components/ParameterForm.vue
index 2787de5..d2b2c40 100644
--- a/webui/src/components/ParameterForm.vue
+++ b/webui/src/components/ParameterForm.vue
@@ -305,15 +305,6 @@
 
               <q-card-section>
                 <div class="row q-col-gutter-md">
-                  <div class="col-12 col-md-6">
-                    <q-input
-                      v-model="params.optional.voltage_n"
-                      type="number"
-                      label="计算时电压分成多少份"
-                    >
-                      <q-tooltip>将电压波形离散化的份数，即将交流电压在一个周期内的不同值进行计算。</q-tooltip>
-                    </q-input>
-                  </div>
                   <div class="col-12 col-md-6">
                     <q-input
                       v-model="params.optional.max_i"
@@ -452,7 +443,7 @@ const defaultParams: AllParameters = {
     u_50: -1
   },
   optional: {
-    voltage_n: 3,
+    voltage_n: 1,
     max_i: 300
   }
 }
@@ -481,14 +472,12 @@ const currentType = computed(() => {
   return params.parameter.rated_voltage.includes('±') ? 'DC' : 'AC'
 })
 
-// 监听电压等级变化，同步更新 ac_or_dc 和 voltage_n 字段
+// 监听电压等级变化，同步更新 ac_or_dc 字段
 watch(
   () => params.parameter.rated_voltage,
   (newVoltage) => {
     const isDC = newVoltage.includes('±')
     params.parameter.ac_or_dc = isDC ? 'DC' : 'AC'
-    // DC 时电压份数为 1，AC 时为 3
-    params.optional.voltage_n = isDC ? 1 : 3
   },
   { immediate: true }
 )