diff --git a/A/4/kinematics_check.py b/A/4/kinematics_check.py
index de87c55..4a59d6b 100644
--- a/A/4/kinematics_check.py
+++ b/A/4/kinematics_check.py
@@ -188,7 +188,7 @@ if __name__ == "__main__":
   orbit = BetterOrbit()
   loong = Loong(orbit, 224, mp.mpf("1.0"), mp.mpf("1e-8"))
   res_list = []
-  for ti in np.arange(5, 10, 0.025):
+  for ti in np.arange(10, 20, 0.025):
     print(f"calculating time_point={ti}", file=sys.stderr)
     res_list.append(loong.CalcStatusListByTime(mp.mpf(ti), res_list[-1] if res_list else None))
     # 转换成内置浮点数并保留6位
diff --git a/A/4/seek_max.py b/A/4/seek_max.py
index 4adcf54..0d3e738 100644
--- a/A/4/seek_max.py
+++ b/A/4/seek_max.py
@@ -6,9 +6,13 @@ kSampleNum = 1000
 kStep = (kTiEnd - kTiBeg) / kSampleNum
 kParallelNum=24
 tasks_list = [i for i in np.arange(kTiBeg, kTiEnd, kStep)]
-for i in np.arange(0, 10, 0.1):
+for i in np.arange(10, 20, 1/1000):
   tasks_list.append(i)
-for i in np.arange(5, 10, 5.0/1000):
+for i in np.arange(12, 14.2, 1/10000):
+  tasks_list.append(i)
+for i in np.arange(13,13.2,1/100000):
+  tasks_list.append(i)
+for i in np.arange(13.085,13.095,1/1000000):
   tasks_list.append(i)
 task_list_per_process=[tasks_list[i::kParallelNum] for i in range(kParallelNum)]
 
@@ -18,18 +22,33 @@ def ProcessEntryPoint(arg):
   orbit = GoodOrbit()
   loong = Loong(orbit, 224, mp.mpf("1.0"), mp.mpf("1e-8"))
   max_speed_found=mp.mpf("0.0")
+  max_speed_time=0
+  last_status = None
+  last_ti = ti_list[0]
   for ti in ti_list:
     print(f"calculating time_point={ti}",file=sys.stderr)
-    res = loong.CalcStatusListByTime(mp.mpf(ti))
-    for node in res:
-      max_speed_found=max(max_speed_found,node["v"])
-  return max_speed_found
+    try:
+      res = loong.CalcStatusListByTime(mp.mpf(ti), last_status if (last_status and abs(ti-last_ti)<=0.1) else None)
+      for node in res:
+        if node["v"] > max_speed_found:
+          max_speed_found = node["v"]
+          max_speed_time = ti
+      last_status = res
+      last_ti = ti
+    except ValueError as e:
+      print(f"Error: {e}",file=sys.stdout)
+  return max_speed_found, max_speed_time
 
 if __name__ == "__main__":
   manager = multiprocessing.Manager()
   task_args_list = [(task_list_per_process[i], i) for i in range(kParallelNum)]
   with multiprocessing.Pool(processes=kParallelNum) as pool:
     res_list=pool.map(ProcessEntryPoint, task_args_list)
-  max_speed_found=max(res_list)
+  max_speed_found=mp.mpf("0.0")
+  max_speed_time=0
+  for res in res_list:
+    if res[0]>max_speed_found:
+      max_speed_found=res[0]
+      max_speed_time=res[1]
   valid_head_speed = mp.mpf("1.0") * (mp.mpf("2.0")/max_speed_found)
-  print(f"max_speed_found={max_speed_found}, valid_head_speed={valid_head_speed}")
\ No newline at end of file
+  print(f"max_speed_found={max_speed_found} at {max_speed_time}, valid_head_speed={valid_head_speed}")
\ No newline at end of file