The foundation of the Danshan large scale piling mountain in Zhenjiang city mainly comprises of the Triassic argillaceous limestone，strongly weathered diorite and soft soil. The composition of the filling soil is consistent with the clay, which the maximum dry density and the optimal moisture content are calculated to be 1.68g/cm3 and 18.2% respectively. The strength of filling soil is lower than the undisturbed soil when the filling soil after being rolling compacted is with moderate compression, If the method of stage construction could be used, the differential settlement of the artificial mountain be greatly reduced. By the analysis of the physical and mechanical properties of the filling soil and the stability of artificial mountain, the stability of the west and the south slope are worse than the east and the north. The stability results by numerical simulation match the limit equilibrium method very well.