Abstract: Design and analysis of reactor loop system is an important part of the reactor design．The emergence of some special software for design and analysis of piping system makes it possible to build database and realize database management as well as paperless design throughout the whole process．This paper summarized the design and analysis processes．An engineering database platform was built for the piping design and analysis system．Some difficulties and key methods of the platform were also analyzed．The work presented above is the basics for establishing the piping design and stress analysis engineering database．