Abstract: In order reduce the impact of mining surface subsidence on the living and ecological environment of the peoples and the economics losses of mining area,the surface subsidence early warning information system based on VB language of mining area is developed.According to the use of compatibility of GIS software,the MapX is taken as the development platform,the VB language is taken as the development environment,the logical database is established by adopting the ID code associated technology,combing with the subsidence theory model,probability integral model,early warning model,and secondary development technologies,the mining surface subsidence early warning information system is developed by adopting the visual development tools of Visual Studio 2008,besides that,the goal of data visualization into the database is realized.The database design process,structures and functions design process of the system are analyzed in detail,based on the actual field measured data of a iron mine in Anhui province,the surface subsidence curve,horizontal movement curve,curvature curve,tilt curve,horizontal deformation curve are obtained.The application results show that maximum surface subsidence values of all monitoring periods are calculated accurately,the comparison analysis of the maximum surface mining subsidence values of the actual field measured data is conducted,the subsidence situations of the monitoring points of surface mining subsidence are shown by using the curve graphs,if the early warning value is exceeded by the maximum surface mining subsidence value,the early warning of the surface mining subsidence of the iron mining area is realized,to provide some reference for the safety production of the iron mining area.

Key words: Mining subsidence, VB,GIS, Early warning information system, Logical database, Structures and functions of system