Abstract: To reasonably determine prediction parameters in a surface subsidence model for an underground non-bedded shape room environment,the internal relations between prediction parameters and underground room shapes were analyzed based on the principles of surface subsidence.In addition,the variation laws of prediction parameters were investigated and the corresponding calculational formulas were derived.From the attitude of strata and the number of characteristic point at an underground non-bedded shape room,the method to determine the equation of stratum structure was presented.Finally,a practical example of surface subsidence predicting was given.The predicted result shows that compared with the conventional method,the proposed method raises the prediction precision of surface subsidence by about 40%.