By conducting geological and engineering evaluation on deep coalbed methane injection in North Section, Shizhuang, South Qingshui Basin, methane extraction technology by deep coalbed injection of CO2 is thought applicable for north block, Shizhuang. By miniature and pilot test for SX-001 well, change rules of gas production, water production, gas composition and well bottom pressure of the SX-001 well before and after injection are summarized. The gas production after injection is 2.45 times of that before injection as shown by on-site test. Under pressure lower than rupturing pressure for coal seam, 20 of CO2 can be injected smoothly daily with slow elevation of pressure. After injection of CO2, the coal rock swells and the local coal seam get less penetration ratio, which recovers after extraction for a period of time. The total replacement ratio of hydrocarbon gas reaches 14.18 cm3/g within the scope influenced by CO2 injection in the target coal seam. The test result proves that extraction of coalbed methane by CO2 injection can realize burial of CO2 and elevation of recovery ratio for the coalbed methane well.