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The urban land grading information system can realize automatic and dynamic management on land grading. The technology of components geographic information system (ComGIS) stands on the current tide with GIS development. SuperMap Objects, which have been developed by SuperMap Corporation in Beijing and are composed of a series of ActiveX components, have strong GIS functional power. Firstly, the method and technology of urban land grading are discussed; secondly, the database design, structure and function, integration model and main techniques about the urban land information system are analyzed in detail; finally, the system realization is expounded for selecting Visual Basic as development environment and SuperMap Objects as ActiveX. The system based on ComGIS can enhance the work of land grading greatly.