Efficiency of the clipping algorithm in computer graphics will directly affect the graphics computing, processing, display speed, and user experience. Around the redundant computing, reuse of objects, multithreading control, etc. in the reducing cycle, this study improved traditional vector clipping algorithms in Java environment. This improved algorithm is superior to the traditional vector graphics clipping algorithm in terms of execution efficiency and memory consumption. The application of proposed algorithm can effectively improve the efficiency of engineering graphics generation.