In order to promote the role of geochemical observation data and methods in anomaly analysis and seismic regime tracking,China Earthquake Networks Center(CENC) has established a geochemical database system under the Linux system,which applies database technology,Geographic Information System(GIS),WebGIS and other technologies together. The system includes sample inspection,laboratory testing,report output,data storage,screening,download and analyzing,diagram rendering and other functions. In terms of data analysis,the system uses Piper plotting,Na-K-Mg plotting,isotope analysis diagram and other methods to analyze the geochemical characteristics of different samples. Since popularization,the system has collected a large amount of geochemical observation data,improved the availability of data,reduced the technical difficulty of geochemical data analysis,and played an important role in the anomaly property detecting and earthquake tracking.