Abstract: During weld structured light inspection, the image quality deteriorates because of the complex characterizations of the weld surface. In order to improve the image quality of structured light, a multiple exposure method based on reliability evaluation was proposed. The reliability of structured light was healed as the image quality parameter to obtain the exposure parameter and to determine the end of image shooting. The experimental results show that the multiple exposure method based on reliability evaluation was accurate and reliable for fillet weld shape inspection. The proposed method can effectively avoid measurement error and data loss caused by local image degradation.