Abstract: An Arithmetic of Angular measurement systerm of Inductosyn signal is designed，and it be detailed. When goniometric systerm began to work ,the method gived a software solution to get the integer angle value ，which just parsed the data that converted form inductosyn signal by AD2S1210. As a result ,the method predigested the hardware circuit of goniometric systerm and enhanced the  goniometric realtime ability.

Key words: Angular measurement systerm, Anolog-digit convert, Signal processing, Arithmetic