Abstract: Aiming at the features of low permeability and soft coal quality in coal seams of some mines, the field experiment research was carried out through the joint application of screen pipe protection hole and CO₂ phase change fracturing technology, it has been found that when the blasting depth is 30 meters to a mine, the gas extraction and concentration in single hole with 50 meters screen pipe protection hole increased an average of 4.2 times and 1.5 times compared to the drilling without blasting hole and screen pipe, and the gas extraction and concentration in single hole increased an average of 2.4 times and 1.2 times compared with the singe CO₂ phase change fracturing without screen pipe protection hole.