In order to satisfy the need of evaluation and dynamic management of mineral reserves in Longqiao mining Co,the digital ore body system was constructed using Dongfang Mineral Resources Estimation System.The system has achieved the integration of the information management of geologic data and survey data,delimitation of ore bodies,geological cartography and reserves estimation,can provide accurate and reliable such geological information as the changes in the shape and grade of orebody in time for stope design,most optimum disposition of resources and dynamic reserves management.