The die casting parts produced by the traditional die casting process cannot be brazed due to the difficulty to solve the problem of hydrogen hole. The temperature can reach 600 ℃ during brazing process， and the gas hole in the die casting will be heated to expansion during the heating process， leading to bulge phenomenon， which cannot meet the appearance requirements. The hydrogen in the die casting could be released during the heating process， forming hydrogen holes， affecting the fusion of casting and solder， resulting in unstable welding， which is one of the main reasons for affecting the strength and tightness. The traditional die casting technology was improved to produce die casting parts meeting the requirements of brazing.