Abstract: According to collected data information of mine,the paper used trigonometric function analysis method to determine influence range of ground subsidence in mine-out area.It selected six factors that is roof lithologic character, thickness of losses bed,mining depth,terrain slope,hydrogeology condition and mining degree as evaluation sub-factors of risk prediction of ground subsidence and built a judging model and judging indexes of risk of ground subsidence.It used AHP method to quantify each judging index and get comprehensive analysis judging index which could be divided into three levels of danger area,more dangerous area and stable area.