Abstract: Collapse pit is one of the main forms of surface subsidence in the old mining area experienced small coal mining.Surface collapse may occur suddenly even in non-mining period in some mining areas.Seriously affecting the safety of life and property of residents.This paper is based on the surface subsidence events in a mining area city in northern China,Causes of ground subsidence pits are comprehensively analyzed from coal seam occurrence conditions, coal mining history and natural conditions.According to the mining situation in this area, the housing safety situation near the collapse pit is analyzed.It can provide scientific theory and technical support for the prevention and treatment of ground collapse under similar conditions.