Abstract: This paper briefly describes the status of seismic precursory data restored in Center for the Earthquake Precursory Observation Network of China (CEPON G), Center for Analysis and Prediction, CSB and the necessity of realizing data share th rough Internet. The authors analyzed in detail the system structure and its technique of two common general Web database named the system structure on the basis of CGI and the one on the basis of API. By considering ha rdware condition of CEPONC, the database platform used and the complexity and variety characteristics of seismic precursory data, we use the system structure of CGI to compile application program and then realize precursory data share through Internet. Specifically, we use WWW Server and Web Sever as application running envi ronment through Brow ser such as Internet Explorer (IE) and Net scape to realize seismic precursory data sharing service. The search for precursory data of arbit rary stations, various observational methods, different times and locations is provided, and the information network service function for seismic precursory data is realized.

Key words: Precursory data, Data share, Common gate interface, Internet