diff --git a/backend/app/services/simulation_config_generator.py b/backend/app/services/simulation_config_generator.py
index 4a5be06..ebddf50 100644
--- a/backend/app/services/simulation_config_generator.py
+++ b/backend/app/services/simulation_config_generator.py
@@ -24,6 +24,19 @@ from .zep_entity_reader import EntityNode, ZepEntityReader
 
 logger = get_logger('mirofish.simulation_config')
 
+
+def _sanitize_hours(val, default):
+    """Fix LLM-generated hour arrays that got concatenated into single values."""
+    if not isinstance(val, list) or not val:
+        return default
+    if len(val) == 1:
+        item = val[0]
+        if isinstance(item, str) and len(item) > 2:
+            return default
+        if isinstance(item, (int, float)) and item > 23:
+            return default
+    return [h for h in val if isinstance(h, int) and 0 <= h <= 23] or default
+
 # 中国作息时间配置（北京时间）
 CHINA_TIMEZONE_CONFIG = {
     # 深夜时段（几乎无人活动）
@@ -631,12 +644,12 @@ Field descriptions:
             minutes_per_round=result.get("minutes_per_round", 60),  # 默认每轮1小时
             agents_per_hour_min=agents_per_hour_min,
             agents_per_hour_max=agents_per_hour_max,
-            peak_hours=result.get("peak_hours", [19, 20, 21, 22]),
-            off_peak_hours=result.get("off_peak_hours", [0, 1, 2, 3, 4, 5]),
+            peak_hours=_sanitize_hours(result.get("peak_hours"), [19, 20, 21, 22]),
+            off_peak_hours=_sanitize_hours(result.get("off_peak_hours"), [0, 1, 2, 3, 4, 5]),
             off_peak_activity_multiplier=0.05,  # 凌晨几乎无人
-            morning_hours=result.get("morning_hours", [6, 7, 8]),
+            morning_hours=_sanitize_hours(result.get("morning_hours"), [6, 7, 8]),
             morning_activity_multiplier=0.4,
-            work_hours=result.get("work_hours", list(range(9, 19))),
+            work_hours=_sanitize_hours(result.get("work_hours"), list(range(9, 19))),
             work_activity_multiplier=0.7,
             peak_activity_multiplier=1.5
         )
@@ -890,7 +903,7 @@ Return JSON format (no markdown):
                 activity_level=cfg.get("activity_level", 0.5),
                 posts_per_hour=cfg.get("posts_per_hour", 0.5),
                 comments_per_hour=cfg.get("comments_per_hour", 1.0),
-                active_hours=cfg.get("active_hours", list(range(9, 23))),
+                active_hours=_sanitize_hours(cfg.get("active_hours"), list(range(9, 23))),
                 response_delay_min=cfg.get("response_delay_min", 5),
                 response_delay_max=cfg.get("response_delay_max", 60),
                 sentiment_bias=cfg.get("sentiment_bias", 0.0),
diff --git a/backend/scripts/run_reddit_simulation.py b/backend/scripts/run_reddit_simulation.py
index 854eeb0..6a6d770 100644
--- a/backend/scripts/run_reddit_simulation.py
+++ b/backend/scripts/run_reddit_simulation.py
@@ -620,18 +620,19 @@ class RedditSimulationRunner:
                 print(f"  已发布 {len(initial_actions)} 条初始帖子")
         
         # 主模拟循环
-        print("\n开始模拟循环...")
+        print("\n开始模拟循环...", flush=True)
         start_time = datetime.now()
-        
+
         for round_num in range(total_rounds):
             simulated_minutes = round_num * minutes_per_round
             simulated_hour = (simulated_minutes // 60) % 24
             simulated_day = simulated_minutes // (60 * 24) + 1
-            
+
             active_agents = self._get_active_agents_for_round(
                 self.env, simulated_hour, round_num
             )
-            
+
+            print(f"  Round {round_num+1}/{total_rounds}: hour={simulated_hour}, active={len(active_agents)}", flush=True)
             if not active_agents:
                 continue