Selection of locating feature point in X-ray detection images for laser weldments with complex structure was discussed, mathematic models of defects depth and deviation were established, and spatial distribution feature of defects in precision weldments was determined. Automated extraction algorithm of defects spatial location data was provided, the quick extraction of defects spatial location data in laser weldments with complex structure was achieved, and experimental verification was proceeded. The results show that the extracted extraction algorithm is feasible. Three-dimensional model of laser weldments with complex structure are established after the spatial location data of defects is input, the visualization of spatial location for bulk defects in laser weldments with complex structure is achieved.