Abstract: Five strip mining subsidence coefficient calculation formulas are studied. Changes of mining depth,mining height,mining rate,mining width/leave width band effect on mining subsidence coefficient are investigated. Also,the expression characteristics of five empirical formulas are analyzed. Based on the comparative analysis,the paper concludes that all kinds of strip mining subsidence coefficient calculation formulas are defective,which is owe to the diversity of mining conditions,the limitations of measured data and statistical analysis method. The paper also found a universal empirical formula. The selection of strip mining subsidence coefficient calculation formula should be reasonable according to the factors of mining conditions.