Geological environment in Tangshan City is under investigation with reference to the Tangshan Urban Earth Science, geo-hazards maps. The expected loss for urban land utilization is calculated by employing relevant economic mathematic models. Quantitative analysis and comprehensive evaluation are then exercised for the capability of land utilization and a series of charts for the analysis of land-use capability are worked out to provide the basis for the formulation of controlling measures for urban planning and to ensure the utmost conformity between land-use and geological environment in urban planning.