Abstract: To study the effect of hard rock strata on the impact ground pressure and its fracturing,the ground horizontal well fracturing technology is proposed to control the thick hard roof to reduce the breaking step distance and energy release strength by changing its breaking characteristics.Based on the experimental analysis,the parameters of rock layer brittleness,fragile and clay mineral content and rock formation are obtained to comprehensively evaluate the fracture evaluation of thick hard roof.The results show that the horizontal and vertical crack on the thick hard roof helps to weaken the mining pressure of the instability and breaking of the thick hard roof.The fragility coefficient of the main controlled rock layer on the roof of Hongqinghe Coal Mine was 67%,the clay mineral content 28.46%,the brittle mineral content of the main controlled rock layer 60.82%,and the mirror mass reflectivity R_o 0.52%.The data indicate that the master rock layer has a high fracturing ability.This study provides a reference for the subsequent implementation of ground horizontal well fracturing technology.