Strength calculation and checking of key pumps parts have great effects on performance and lifespan of complete machines, conventional methods of strength checking could hardly meet the demands in design precision and efficiency. During the past years, researchers of Jiangsu University have been studying on it and developed a suit of software that was utility to solve this problem. Models of program for strength calculation of volute case over the corresponding theory have been established. The development platform, tools and several key technologies were described and analyzed in detail. The running results of the program are accurate and the program has great prospects in application.