Geological hazards such as landslide and debris flow possibly occur in heap leaching.The reasons and possible harms of the geological hazards are analyzed.The inherence relations between macroscopical phenomenon and microcosmic reactions on the mechanism of the geological hazards in heap leaching are discussed.The existent status of leaching solution in ore dump and the reaction process in ore particles are mostly researched.Take copper leaching as example,the mechanism of mechanical reaction in leaching is analyzed.