A database is established to store 11 types of seismicity anomalies information based on 266 earthquake cases collected in “Earthquake Cases in China” from 1966 to 2012 for easily adding,extracting,modifying and managing. The 11 types of seismicity anomalies are seismic belt,gap,quiescence,b-value,foreshock,frequency,swarm,seismic window,wave velocity ratio,apparent stress,consistency parameter of focal mechanism. The software,Assistant Decision System,is developed on the basis of lightweight GIS technology about seismicity anomalies from “Earthquake Cases in China”,and easy to operate and use. The software can achieve the following functions: ①Search Function. Inquire about the definition,basic principles,application,main references and other information about the 11 types of seismicity anomalies,about an anomaly pictures collected in “Earthquake Cases in China”,about the maps of important research results. Users can search and read the “Earthquake Cases in China” and other research papers in PDF format. ②Functions of statistics and drawing. The software can draw the analytical charts and users can make elementary conclusion through the relationship between the 11 types of seismicity anomalies and the magnitude,time,and position of the main shocks in different regions,such as Chinese mainland,customized polygon and rectangle,provincial boundaries and tectonic division. ③Storage Function. Charts can be saved to the target folder by clicking the screenshot button. The system provides an assistant decision platform to determinate anomalies and conclude prediction index for users.