diff --git a/README.md b/README.md
index 832fb08e3aa5883bbb064c824de862795e099677..c70a02782325b0d0ba9acae142e7c79a5da38da2 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,7 @@ The software has three main modules:
 
 We also provide `main.py` as a warpper for all the modules above. By runing it, you can make Farmbot automatically conduct the whole process. The three modules can also be run sperately, mostly for debugging purpose.
 
-First go to `/src/` to run the following scripts.
+First go to `/src/` and `conda activate <env>` to run the following scripts. `<env>` is the same as the one you created in *Install, Compile*
 ### Move Famrbot, take photos, and open/close the gripper
 ### YOLO detection
 All the arguments for file path are set to default. 
diff --git a/src/detect.py b/src/detect.py
index 28f2fe8f7787c64d68265c92d03b55d720b58b29..acccc62fb22f742f7b50cf8ec6477c9466c3484a 100644
--- a/src/detect.py
+++ b/src/detect.py
@@ -120,7 +120,7 @@ def save_annotations(original_size, name, image, detections, class_names):
             f.write("{} {:.4f} {:.4f} {:.4f} {:.4f} {:.4f}\n".format(label, x*width, y*height, w*width, h*height, float(confidence)))
 
 
-def main():
+def detect():
     args = parser()
     check_arguments_errors(args)
 
@@ -160,4 +160,4 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
+    detect()
diff --git a/src/location.py b/src/location.py
index 864ca95948b97d960eabb13fa087b6636b8540e0..69a8b163d5d7cda4475321241476efaeabf727b4 100644
--- a/src/location.py
+++ b/src/location.py
@@ -254,6 +254,7 @@ if __name__ == '__main__':
 
     parser.add_argument('-v', '--verbose', action='store_true', help='Verbose mode')
     arguments = parser.parse_args()
+
     if arguments.verbose:
         basicConfig(filename=arguments.log, level=DEBUG)
     else:
diff --git a/src/main.py b/src/main.py
index c4d9b16c9a93fedf37cc59f677a825de4aa99820..ba5dc8adb13f7a695c6ee730ebe7458ffafa07c4 100644
--- a/src/main.py
+++ b/src/main.py
@@ -17,30 +17,30 @@ from location import *
 _Log = getLogger(__name__)
 
 
-def remove_overlap():
-    return
+def remove_overlap(table_coordinate:DataFrame, tolerance=50.00)->DataFrame:
+    '''
+    compare every two coordinates, if their Euclidean distance is smaller than tolerance
+    , delete the one with lower probability
+    '''
+    # 这又要求重写前面的了，加入 probability
+    return table_coordinate
 
 # 还要定期清理掉img下所有文件
 def remove_temp():
     return
 
-def choose_class(category: int) -> :
-    '''
-    Choose the category to pick up
-    '''
-    return
-
 
 def main(args: Namespace):
     # scan
-    
+    scan()
     # detect
-
+    detect()
     # calculate locations
-
+    list_global_coordinate = cal_location()
     # choose class
-    list_global_coordinate[:, 0]
-
+    table_global_coordinate = DataFrame(list_global_coordinate, columns=['class', 'x', 'y'])
+    goal_class = list_global_coordinate[table_global_coordinate['class']==args.category]
+    # 添加一个if判断，如果该类为空，则显示
     # remove overlap
 
     # move
@@ -79,8 +79,8 @@ if __name__ == '__main__':
         )
     # arguemtns for grip
     parser.add_argument(
-        '-cl',
-        '--class',
+        '-ca',
+        '--category',
         type=str,
         help='Choose the class of fruits to be picked up. There are tomato, mushroom,\
         potato, carrot, beetroot, zucchini, hand'
diff --git a/src/move.py b/src/move.py
index 5f380fad72ab352bb56a702d7e052d9a40222f4e..32efa824a47eb09562a46c8f75670dccbbe842a6 100644
--- a/src/move.py
+++ b/src/move.py
@@ -39,10 +39,11 @@ class Opts:
         self.flag = flag
     
 
-def scan(min_x=0, max_x=1300, min_y=0, max_y=1000, delta=500, offset=0, flag=True) -> List:
+def scan(min_x=0, max_x=1300, min_y=0, max_y=1000, delta=500, offset=0, flag=True) -> List: #里面的数字需要重新测量
     '''
     scan the bed at a certain height, first move along x axis, then y, like a zig zag;
     Taking pictures and record the location of the camera that corresponds to the picture
+    The default value of x, y should be from the measurement of Farmbot
     Input: min_x: left most point on x axis
            max_x: right most point on x axis
            min_y: front most point on y axis
@@ -77,7 +78,7 @@ def scan(min_x=0, max_x=1300, min_y=0, max_y=1000, delta=500, offset=0, flag=Tru
         #client       #需要添加一个函数，读取当前位置,需要吗？
         client.take_photo() # 拍照时，需要记住每张照片对应的相机位置！
     client.shutdown()
-    return pts
+    return pts # 这里应该写入文件 img/location
 
 
 def download_images() -> Path: