Abstract: The caving of overlying rock and orebody，and associated ground surface subsidence is a complex issue involving time and space.Based on the project of “Modelling Block Caving to Surface” proposed by CEMI，numerical investigations were conducted on the caving state and ground surface subsidence involving deep and large-scale caving.The evolution of pressure equilibrium arch and the fracturing process in rock mass were numerically obtained.It is shown that evolution of pressure equilibrium arch is the triger of caving with intermission and jump.The break angle，fracture initiation angle and associated ground surface subsidence are all depended on the caving state of overlying rock and orebody.

Key words: Caving method, Subsidence of ground surface, Evolution of stress, Numerical simulation