Abstract: In order to achieve the best blasting effect, quasi static strength test and dynamic blasting splitting test were carried out. And the release pressure and the thickness of the constant pressure shear sheet of the carbon dioxide fracturers were analyzed, and the relationship between the amount of heating material and the filling amount of liquid carbon dioxide were determined. Finally, the model of discharge pressure were obtained. The optimal layout of the outlet was analyzed through the calculation and analysis of pressure and three-dimensional fluid simulation. The test results showed that when the thickness of the shear sheet was 3 mm, the quasi-static shear strength was 130 MPa, and the reasonable amount of heating material was 113 g, and the peak discharge pressure was about 185 MPa. When the thickness was 4 mm, the quasi-static shear strength was 220 MPa, and the reasonable amount of heating material was 163 g, and the peak discharge pressure was about 263 MPa. Under the premise of guaranteeing the overall stiffness, the length of the discharge channel was minimized and the diameter of the hole was increased. The cross section area was the same as that of the constant pressure shearing slice, the cavity wall was smooth and the angle of outlet inclination was 75 °.