On June 25, the coke oven cock was replaced and fired to deal with the gas leak in the basement. The reason for the cracking phenomenon in the carbon removal hole of the exchange cock in the coke oven basement. When cracking occurs, the gas leakage in the basement should be dealt with promptly. A new exchange cock should be used, the lower nozzle and the brick gas channel should be checked, and the leakage should be sprayed with grout. The firing occurs about 10 to 20 seconds after the exchange. Most of them occur in brick air ducts where updraft changes to downdraft.