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At present, triangulated irregular net is the best method of fine landform expression, so the paper discusses applying triangulated irregular net to establish fine DEM of open-pit. Because of complicated landform characteristic, corresponding constraint condition should be considered in building model process, otherwise it will appear phenomenon that flight of steps is cut. The method of triangulated irregular net establishment is detachable for divide and conquer algorithm, piecemeal intervene in algorithm and triangle net growth algorithm. The various algorithm has excellence and shortcoming respectively, combined with the mining area actual situation, this paper adopt the constrained triangulated irregular net once generation algorithm, through spatial data extraction, topological relations generation and spatial indexing generation, constrained triangulated irregular net is generated within boundary line at last.