Based on the theme of data acquisition system,this paper summarizes and sorts out the application of data acquisition system in the field of welding from five aspects:the principle and technology used in data acquisition system,the management of welding process parameters,remote fault diagnosis and release of process parameters,welding database and welding quality prediction expert system,lean workshop operation management. The future development of this technology is prospected. At present,the data acquisition system mainly relies on computer technology,network technology and all kinds of sensors. Through realtime acquisition,monitoring and recording of the relevant information in the welding process,the welding process can be traced back. The recorded data can be analyzed and stored to provide firsthand data for the establishment of welding database. The comparative analysis of welding process data and post welding inspection data can provide data support for the establishment of welding quality expert prediction system.The system can also realize the remote diagnosis of equipment running fault and the remote release of process parameters.This system is helpful to realize the lean management of the workshop. It can not only reduce the material loss and production cost,but also indirectly improve the welding quality.