Abstract: Dahongshan iron mine is one of the largest underground mining mines in our country，and its sublevel caving structural parameters in the main mining area are leading demostic now.Large-scale deep mining has caused complex stresses among every mining areas.Rock movement and surface subsidence law induced by deep mining of sublevel caving was studied after the overburden caving in chamber blasting in Dahongshan iron mine，and the surface subsidence and the cracks developing process were summarized.Through the systematic analysis on the impact of deep mining on surface subsidence and cracking，the rock caving angle resulting from rock movement was obtained.According to the value，the scope of future surface cracking was delineated.Through analyzing ground surface subsidence and related underground pressure monitoring data，the conclusions that surface of collapse pit and underground rock tend to be relatively stable after blasting was got，which indicates that overburden failure of the sublevel caving plays an important role in releasing high stress of the deep mining，ensuring adequate overburden thickness and controlling the rock movement.

Key words: Deep mining with sublevel caving, Rock movement law, Surface subsidence and settlement law, Rock caving angle