Abstract: Leaching is one of important ways of hazardous trace elements from coal-waste rock and ash causing environment pollution.In this paper,based on the leaching experiments of coal-waste rock from Xinmi-Xinggong mining field in Henan Province.The changing regularities of pH values and leaching contents of hazardous trace elements from coal-waste rocks are studied.The different methods of leaching experiments impact on the leaching out of and the environmental significance of hazardous trace elements from coal-waste rocks are analyzed.