Abstract: Taking pressure vessel manufacturing enterprises in Shaoxing as an example,the welding status of enterprises was investigated and studied. The results showed that traditional manufacturing mode was still the main mode in the current pressure vessel welding manufacturing industry,where manual visual monitoring of welding process was needed basically and the degree of welding intelligence was seriously insufficient. Welding factors of pressure vessels were analyzed by principal component analysis(PCA) and two independent principal component indexes were obtained which mainly corresponded to welder factor and welding hardware equipment factor. Key factors of pressure vessel welding intelligence upgrading were illustrated by combining with the actual investigation of enterprises and then approaches to realize pressure vessel welding intelligence were discussed,which could provide a decision basis for the related industrial upgrading.