Based on mechanics characteristics of deep coal rock mass and analysis of the mechanism of rock instability, high strength pressure relief bolt was adopted to support the deep and soft rock roadway, the surrounding rock pressure relief degree was settled by the calculation of reinforcement theory of surrounding rock strength and elastic energy release method. High strength constant-resistance pressure relief was realized by anchor bolt constant-resistance pressure relief circle, reducing the unbalanced stress damage to surrounding rock, releasing the surrounding rock elastic energy in initial stage and improving the reliability of support system, control the shrinking percentage of roadway section, keeping the surrounding rock flow change in stable, avoiding its damage.