Abstract: From static effect after blasting in coal and rock body,influence of pressure-relief blasting on rock-burst danger degree was researched in this paper.Applying numerical simulation,influence of protective zone width b and depression angle of blast-hole θ was analyzed.Results showed that rational b value should make stress take on small inner summit and large outer summit state at the pressure-released side of roadway,other b values could not decrease rock-burst danger degree,and that θ determined pressure-relief effect of roadway's sides and floor.