Abstract: At present， scientific anchored bolt supporting design method is dynamical system design method based on computer numerical simulation. Reliability of simulation results largely depends on mechanical parameters of surrounding rock， so how to rationally select these parameters is an urgent problem in anchored supporting design. Applying FLAC， sensitivity of main mechanical parameters influencing stability of surrounding rock was analyzed by orthogonal， and the parameters were obtained by back-analysis with field deformation data of surrounding rock. Applying the back-analyzed parameters and geo-stress test results， anchored supporting for air-return roadway of 5205 mining face in Wangzhuang Colliery was designed. Actual application effect was excellent.