The main purpose of this thesis is to develop a recognition system of numeric code of gesture. The recognition process of numeric code of gesture contains three main steps : hand detection、fingertip detection、and hand gesture recognition. In the stage of hand detection, first we extract skin region from image by color segmentation, then the methods of image projection and connected components labeling are utilized to detect the hand regions. In the stage of fingertip detection, the edge detection and fingertip mask are used to find out the coordinates of fingertip. Finally, in the stage of hand gesture recognition, the different gestures which have the same number of fingers are identified according to the relationship of angle and distance between the recognized fingers.