Aiming at the problem of non-destructive collection of latent fingerp r ints and low detection rate in the field investigation,this paper designs a lat ent fingerprint detection method based on polarization method.By using a lightw eight,small-volume portable polarized camera to acquire the fingerprint polari z ation image on the acrylic plate sample under the active light source condition, the linear polarization degree,the linear polarization angle,and the full-co l or image information of the fingerprint sample are respectively obtained,and th e target is established on the basis of this.The image information of the polar ized HSV model of the image and the wavelet-based image fusion processing of th e full-color visible light image and the polarization image are obtained,and a better latent fingerprint matching effect is obtained.