Abstract: There have recently been more and more applications based on gesture interaction system applications, but they mainly utilize simple gestures to operate the mouse interaction and have not the function of inputting text into the system. This paper proposes a method of inputting Chinese characters into the systems by using the blind letters gestures as input gestures. In this method, the Kinect of Microsoft is utilized to obtain the depth images, which are further made the split of gestures and the extraction of feature via SIFT. Finally, the method of manual alphabet as Pinyin input is obtained.