In this paper, a professional mining GIS software called Geological and Surveying Spatial Management Information System (GSSMIS) was designed and implemented. Due to restriction of mine design and computerization level, geostatistics and 3D block model were not fully applied in metal mining. The geologists interpreted drill holes and delimit mineral boundaries on the 2D plane and section. Unlike other 3D mining software, a 2D & 3D integration technological architecture for unstratified mineral deposit was proposed considering the conventional exploration and exploitation approaches. The whole system contains 3 modules: geological and surveying database module, 2D MGIS module and 3D modeling and visualization module. Database module input, manage, store and extract all kinds of geological and surveying data. 2D MGIS module provide lots of toolbox for plotting all sorts of engineering maps and processing advance analysis such as geostatistical and uncertain analysis, reserve computation and mining economic estimation. GSSMIS has a typical COM GIS configuration with 5 different developing levels. The 5 level structure has advantage of less coding, easier maintenance and management, good ability of extension and secondary development, adding or subtracting the modules according to user's need. Also, 5 important system characters were introduced in the article, which were: 1) 2D auto-mapping; 2) interactive interpretation of geological boundaries; 3) mutual modifications of plane and section; 4) 3D solid modeling; 5) section profile cutting. Finally, the article presented the implement of GSSMIS in Laixin Iron, Shandong Province. The system changed traditional handcraft mapping mode thoroughly, relieved the heavy burden of engineers and promoted the process of computerization and informatization in China.