Various air treatment modes of the current welding workplace are comprehensively evaluated. Based on the traditional overall workplace air treatment concept, the distributed overall workplace air treatment system is developed，according to the personalized needs of users and at the expense of certain comfort functions. The distributed overall workplace air treatment system is specially designed for welding and other hot process workshops. It uses the concept of stratified air supply of the overall workplace, adopts a group of small integrated air treatment units. It truly realizes the zoning air treatment of the whole workshop, through networking centralized control and zoning joint control. At present, the distributed overall workplace air treatment system has been successfully applied in practical projects. Due to the sacrifice of some comfort functions, the overall investment cost is reduced by more than 20%, which has good popularization and application value. In the future, the post fresh air, auxiliary heating and other functions will be intraduced into the distributed overall workplace air treatment system according to the actual application. This will be further strengthen the adaptability of the distributed overall workplace air treatment system and make the products more vitality.