Abstract: In order to realize weld dimension measurement and surface forming quality assessment, a weld forming quality inspection system based on line structure light was studied.Based on the principle of laser triangulation, the composition and calibration process of structured light vision sensor was discussed in detail, and the image processing is optimized, and the gray gravity center method based on boundary limit was proposed to extract the laser fringe center line. Using a single pixel laser fringe as the information source to characterize the weld contour, a multi-feature point extraction algorithm was used to detect the feature points of the laser fringe contour. The dimension calculation models of butt weld and fillet weld were established based on the identification of characteristic points of weld laser profile curve. Finally, the measurement of weld dimension were realized. The results show that the inspection system of weld forming can obtain satisfactory performance of weld inspection.