Abstract: Underground construction,mining and excessively pumping groundwater are probably led to occur underground room.The subsidence of cities and towns,traffic lines and waters in ground are caused by underground room.Based on the principle of surface subsidence under folding bedded shape room,the methods of describing and disposing the non-bedded shape room are studied in this paper.According to the projection method of non-bedded shape underground room,the primary shapes and integration limits of the projection of the non-bedded shape underground room are determined.And also the computational formulas of the shape coefficients of the non-bedded shape underground room are deduced.