This paper develops a SDK for reconstructing plane geometry figures in documents, which can be used in multiple cases of the education. This SDK is an indispensable function of solving plane geometry problems automatically and it can save the dear time if users use it to replace the work of drawing plane geometry figures. This SDK consists of two main components which are the recognition and the drawing of plane geometry figures. In the component of recognizing plane geometry figures, it has a set of functions that recognize all the primitive shapes of plane geometry figures from image documen...