Abstract: For the direct pressure measurement method, the strict requirements for the selection of test locations and the quality of the sealing lead to a lower success rate of pressure measurement, high test cost and long cycle; while the indirect pressure measurement method has certain deficiencies in experimental operation, technical requirements, etc., a gas pressure measurement technology based on the principle of “state restoration” is proposed for non-sealing coal seams. Relying on the self-developed non-sealing coal seam gas pressure tester, six adsorption equilibrium pressures of 0.10 MPa, 0.31 MPa, 0.53 MPa, 0.74 MPa, 1.00 MPa and 1.50 MPa were set to simulate the occurrence conditions of coal. Through pressure unloading and atmospheric desorption to simulate the downhole sampling process, then carry out quantitative gas supplementation at atmospheric pressure, coal core volume restoration and temperature simulation of reservoir condition, so that the pressure test sample can be stabilized under the same conditions as the reservoir environment. Finally, the six pressure recovery values are 0.09 MPa, 0.30 MPa, 0.50 MPa, 0.73 MPa, 1.01 MPa and 1.61 MPa respectively; the errors of the corresponding initial adsorption equilibrium pressure are -10.00%, -3.23%, -5.66%, -1.35%, 1.00%, 7.33%. The overall error range is between -10.00% and 7.33%, which verifies the feasibility of the gas pressure measurement technology for the non-sealing coal seam.