diff --git a/backend/app/api/simulation.py b/backend/app/api/simulation.py
index e90f354..c7ef7f0 100644
--- a/backend/app/api/simulation.py
+++ b/backend/app/api/simulation.py
@@ -467,6 +467,25 @@ def prepare_simulation():
         use_llm_for_profiles = data.get('use_llm_for_profiles', True)
         parallel_profile_count = data.get('parallel_profile_count', 5)
         
+        # ========== 同步获取实体数量（在后台任务启动前） ==========
+        # 这样前端在调用prepare后立即就能获取到预期Agent总数
+        try:
+            logger.info(f"同步获取实体数量: graph_id={state.graph_id}")
+            reader = ZepEntityReader()
+            # 快速读取实体（不需要边信息，只统计数量）
+            filtered_preview = reader.filter_defined_entities(
+                graph_id=state.graph_id,
+                defined_entity_types=entity_types_list,
+                enrich_with_edges=False  # 不获取边信息，加快速度
+            )
+            # 保存实体数量到状态（供前端立即获取）
+            state.entities_count = filtered_preview.filtered_count
+            state.entity_types = list(filtered_preview.entity_types)
+            logger.info(f"预期实体数量: {filtered_preview.filtered_count}, 类型: {filtered_preview.entity_types}")
+        except Exception as e:
+            logger.warning(f"同步获取实体数量失败（将在后台任务中重试）: {e}")
+            # 失败不影响后续流程，后台任务会重新获取
+        
         # 创建异步任务
         task_manager = TaskManager()
         task_id = task_manager.create_task(
@@ -477,7 +496,7 @@ def prepare_simulation():
             }
         )
         
-        # 更新模拟状态
+        # 更新模拟状态（包含预先获取的实体数量）
         state.status = SimulationStatus.PREPARING
         manager._save_simulation_state(state)
         
@@ -594,7 +613,9 @@ def prepare_simulation():
                 "task_id": task_id,
                 "status": "preparing",
                 "message": "准备任务已启动，请通过 /api/simulation/prepare/status 查询进度",
-                "already_prepared": False
+                "already_prepared": False,
+                "expected_entities_count": state.entities_count,  # 预期的Agent总数
+                "entity_types": state.entity_types  # 实体类型列表
             }
         })
         
diff --git a/frontend/src/components/Step2EnvSetup.vue b/frontend/src/components/Step2EnvSetup.vue
index caae2f9..79475b4 100644
--- a/frontend/src/components/Step2EnvSetup.vue
+++ b/frontend/src/components/Step2EnvSetup.vue
@@ -427,6 +427,7 @@
           </div>
           <div class="step-status">
             <span v-if="phase >= 4" class="badge processing">进行中</span>
+            <span v-else class="badge pending">等待</span>
           </div>
         </div>
 
@@ -434,8 +435,8 @@
           <p class="api-note">POST /api/simulation/start</p>
           <p class="description">模拟环境已准备完成，可以开始运行模拟</p>
           
-          <!-- 模拟轮数配置 -->
-          <div class="rounds-config-section">
+          <!-- 模拟轮数配置 - 只有在配置生成完成且轮数计算出来后才显示 -->
+          <div v-if="simulationConfig && autoGeneratedRounds" class="rounds-config-section">
             <div class="rounds-header">
               <div class="header-left">
                 <span class="section-title">模拟轮数设定</span>
@@ -465,10 +466,10 @@
                     type="range" 
                     v-model.number="customMaxRounds" 
                     min="10" 
-                    max="120" 
+                    :max="autoGeneratedRounds"
                     step="5"
                     class="minimal-slider"
-                    :style="{ '--percent': ((customMaxRounds - 10) / (120 - 10)) * 100 + '%' }"
+                    :style="{ '--percent': ((customMaxRounds - 10) / (autoGeneratedRounds - 10)) * 100 + '%' }"
                   />
                   <div class="range-marks">
                     <span>10</span>
@@ -476,9 +477,9 @@
                       class="mark-recommend" 
                       :class="{ active: customMaxRounds === 40 }"
                       @click="customMaxRounds = 40"
-                      :style="{ position: 'absolute', left: 'calc(27.27% - 30px)' }"
+                      :style="{ position: 'absolute', left: `calc(${(40 - 10) / (autoGeneratedRounds - 10) * 100}% - 30px)` }"
                     >40 (推荐)</span>
-                    <span>120</span>
+                    <span>{{ autoGeneratedRounds }}</span>
                   </div>
                 </div>
               </div>
@@ -665,7 +666,6 @@ const showProfilesDetail = ref(true)
 // 模拟轮数配置
 const useCustomRounds = ref(false) // 默认使用自动配置轮数
 const customMaxRounds = ref(40)   // 默认推荐40轮
-const autoGeneratedRounds = ref(120) // 自动生成的轮数（从配置中读取）
 
 // Watch stage to update phase
 watch(currentStage, (newStage) => {
@@ -683,15 +683,20 @@ watch(currentStage, (newStage) => {
   }
 })
 
-// Watch simulationConfig to update autoGeneratedRounds
-watch(simulationConfig, (newConfig) => {
-  if (newConfig?.time_config) {
-    const totalHours = newConfig.time_config.total_simulation_hours || 120
-    const minutesPerRound = newConfig.time_config.minutes_per_round || 60
-    const calculatedRounds = Math.floor((totalHours * 60) / minutesPerRound)
-    autoGeneratedRounds.value = calculatedRounds || 120
+// 从配置中计算自动生成的轮数（不使用硬编码默认值）
+const autoGeneratedRounds = computed(() => {
+  if (!simulationConfig.value?.time_config) {
+    return null // 配置未生成时返回 null
   }
-}, { immediate: true })
+  const totalHours = simulationConfig.value.time_config.total_simulation_hours
+  const minutesPerRound = simulationConfig.value.time_config.minutes_per_round
+  if (!totalHours || !minutesPerRound) {
+    return null // 配置数据不完整时返回 null
+  }
+  const calculatedRounds = Math.floor((totalHours * 60) / minutesPerRound)
+  // 确保最大轮数不小于40（推荐值），避免滑动条范围异常
+  return Math.max(calculatedRounds, 40)
+})
 
 // Polling timer
 let pollTimer = null
@@ -786,6 +791,12 @@ const startPrepareSimulation = async () => {
       taskId.value = res.data.task_id
       addLog(`准备任务已启动: ${res.data.task_id}`)
       
+      // 立即设置预期Agent总数（从prepare接口返回值获取）
+      if (res.data.expected_entities_count) {
+        expectedTotal.value = res.data.expected_entities_count
+        addLog(`预期Agent总数: ${res.data.expected_entities_count}`)
+      }
+      
       // 开始轮询进度
       startPolling()
       // 开始实时获取 Profiles