Focusing on the interference problem of subsequent detection from highlight on metal surface in the process of 3D laser detection, a peak continuity detection method is proposed. Firstly, gray peak in each column is extracted according to the gray information in gray images. Then, the peak validity is estimated based on laser stripe continuity to remove false peak and maintain the valid, and the effect of highlight can be removed. Finally, experimental results are verified by detecting standard step block. The results show that the reconstruction accuracy after highlight processing is enhanced nearly 50% corresponding to the reconstruction results of common refinement treatment, and the validity of the method is verified.