Abstract: In order to study the released range of the upper protective seam for the protected seam, it took No.762 protective seam mining face as the research object which was in Haizi Coal Mine of Huaibei Mining Group. It investigated rock distribution characteristics for roof and floor of the 7^# protective seam, and the coal stress, displacement distribution law of the 9^# protected seam. Based on these results, it analyzed the scope of protection for protective seam mining. The results showed that: under the condition of fully mining for No.762 protective seam mining face, through calculating the experimental results, it obtained that the effective pressure-relief protection angle was 78°and 79°under the up and down of verge direction, the max expansion rate of the 9^# coal seam was 0.81%.