Abstract: Unlike the existing short-term dumping plan model,the long-term model can reduce the overburden trans- portation cost and avoid adjusting the height of internal dump frequently. The constraint conditions of dump’ s dy- namic adjustment were put forward in this study based on the space-time relations between working slope and inter- nal dump,and the long-term planning model of internal dumping was established for the minimization of the total transportation cost. In addition,the basic data of the model were defined,the solving method of the model was pro- posed,and the calculation methods of dump stage slope position,centroid and volume of entity sliced by dump stage slope and dump stage height were presented. Taken a surface coal mine as an example,the three dimensional geolog- ical model was built. Compared with the results with traditional method,the total overburden transportation cost can be reduced by 17． 8 million Yuan,the dump heights of each stage change slightly,which is beneficial to dump and reclamation.