Hand gesture is an important and natural human-to-human interface in daily life. Hand gesture recognition system is applied to HCI ( Human Computer Interface ) to realize direct and natural communication, which is the development trend and fundamental object of gesture recognition. 手势是人类日常生活中人与人之间最自然的一种交互方式,将手势识别系统用于人机接口,从而实现直接的、自然的人机交互方式,是手势识别的发展趋势和基本目标。