In response to the challenge of controlling the stability of the surrounding rock of stope with stage open stoping and subsequent filling mining method,taking the occurrence conditions of the deep steep-inclined thick ore body in a mine as the background,and from the perspective of changing the geometric shape and structural parameters of stope,it is proposed to change the top of stage stope into an arch structure,and carry out the research on the stability of surrounding rock with arch structure stage open stoping and subsequent filling mining method.Based on the arch shape of the stope and the span-height ratio of the stope in different stages,the influence of the 2 factors on stope stability is analyzed.The research results show that the setting of the arch shape and the optimization of the span-height ratio can improve the overall stability of the stope.By establishing the mechanical bearing model of the stage stope arch structure,the influence weight of arch shape and span-height ratio factors is analyzed.The span-height ratio has the greatest influence on the comprehensive stability of the stope,with an influence weight of 66.41 %,and the arch shape of the stope has a significant influence on the stability of the stope side wall,with an influence weight of 94.83 %.Based on the calculation results of surrounding rock displacement,crack evolution law,and equivalent depth of surrounding rock cracking zone,the optimal stope structure parameters are determined as follows:the height of stope is 50 m,the span is 20 m,and the stope mophorlogy characteristic angle is 55°.