Abstract: To improve the use ratio of blast-hole and the forming quality of roadway, the paper takes the blasting excavation of a coal mine air return rise as the background, analyzes theoretically that the use rate of borehole is low and the underbreak of roadway is serious due to improper cutting type, smaller charge of cutting area, unreasonable parameters of surrounding blasting holes and smaller charge of bottom hole. In the light of theoretical calculation and engineering experience, the parameters of medium length hole blasting are optimized. Results show that optimized blasting scheme selects double wedge cut type, and the dense coefficient of surrounding hole with 0.81 and two rows arrangement of bottom holes make the blast-hole use rate increase to 90%; roadway forming quality improve significantly, almost no underbreak; overbreak is within the scope of the design allows.