diff --git a/pyat/czcore.py b/pyat/czcore.py
index 0615cc2..bc60e74 100644
--- a/pyat/czcore.py
+++ b/pyat/czcore.py
@@ -100,7 +100,7 @@ def call_Bellhop(freq, sd, dr, bathm, ssp, sed, base,azi):
     run_type = 'I'  # incoherently sum beams, see AT docs for more info
     nbeams = 1000
     alpha = np.linspace(-90, 90, 2)  # min and max launch angle -20 degrees to 20 degrees
-    box = Box(Zmax, 100)  # bound the region you let the beams go, depth in meters and range in km
+    box = Box(Zmax, Rmax+10)  # bound the region you let the beams go, depth in meters and range in km
     deltas = 0  # length step of ray trace, 0 means automatically choose
     beam = Beam(RunType=run_type, Nbeams=nbeams, alpha=alpha, box=box, deltas=deltas)  # package
     """删除ssp 已修改 8.26"""
@@ -290,7 +290,7 @@ def child(freq, sd, dr, isPlot, bathm, ssp, sed, base, azi, descript):
     czdetail.descript = descript
     return CzData(azi, ranges, depths, TL, bathym, Rays, czdetail)
 
-def call_cz(database, freq, lat, lon, azi, sourceDepth=10,  dr=0.1, isPlot=False):
+def call_cz(database, freq, lat, lon, azi, sourceDepth=10, R=100, dr=0.1, isPlot=False):
     sd = np.array([sourceDepth])  # Source depth
 
     results = []
@@ -301,7 +301,7 @@ def call_cz(database, freq, lat, lon, azi, sourceDepth=10,  dr=0.1, isPlot=False
     #     return czdata
     ''' 计算单个方向的会聚区 '''
     if azi != None:
-        [bathm, ssp, sed, base] = GetEnv(database, 25, Coord(lon, lat), R=100, azi=azi)
+        [bathm, ssp, sed, base] = GetEnv(database, 25, Coord(lon, lat), R=R, azi=azi)
         if np.mean(bathm.d) >= 2000:
             ranges, depths, TL, bathym, Rays, czdetail = call_fangwei(freq, sd, dr, bathm, ssp, sed, base, azi,
                                                                       isPlot=isPlot)
@@ -315,7 +315,7 @@ def call_cz(database, freq, lat, lon, azi, sourceDepth=10,  dr=0.1, isPlot=False
     descripts = ["正北方向", "东北方向", "正东方向", "东南方向", "正南方向", "西南方向", "正西方向", "西北方向"]
     theta = np.arange(0, 359, 45)
     for i in range(8):
-        [bathm, ssp, sed, base] = GetEnv(database, 25, Coord(lon, lat), R=100, azi=theta[i])
+        [bathm, ssp, sed, base] = GetEnv(database, 25, Coord(lon, lat), R=R, azi=theta[i])
         if np.mean(bathm.d) >= 2000:
             applyResults.append(pool.apply_async(partial(child, freq, sd, dr, isPlot), (bathm, ssp, sed, base, theta[i], descripts[i])))
         # applyResults.append(pool.apply_async(partial(child, database, freq, lat, lon, sd, isPlot), (pi,)))
@@ -331,5 +331,5 @@ def call_cz(database, freq, lat, lon, azi, sourceDepth=10,  dr=0.1, isPlot=False
 # ETOPO1Path = '/home/gan/下载/code/20220920/ETOPO1'
 # database = DataBase(ETOPO1Path, STPath)
 # database.set_timePeriod(timeIndex)
-# res = call_cz(database, 300, 13, 115, 0, 60, True)
+# res = call_cz(database, 300, 13, 115, None, 60, 150, 0.1, True)
 # a = 1