Abstract: Based on TIN model，the calculation method for coal resource reserve is built in order to calculate the coal resource reserves precisely.By using ArcGIS software，Delaunay TIN model based on the original borehole data is built，thus TIN model is converted into grid data according to the linear interpolation.After raster data operation and block map overlay，the coal volume of each block is calculated by the partition statistical techniques.Finally，reserves are calculated by the product of volume and density.Through example application，it is found that this method has obvious effect compared with the calculation results of the traditional segment method.In addition，this method is very applicable to resource reserve estimation and resource coverage quantity calculation under village during mineral exploratory period in the case that there is only borehole data of no coal floor seat such as contour line.

Key words: TIN, Resources reserves, GIS, Overlay analysis, Coal under villages