Living body detection method applied to face identification customs control system

The invention provides a living body detection method applied to a face identification customs control system, comprising the steps of obtaining a plurality of external face images and generating normalized random value form the external face images; when the random value accords with a living body identification threshold value, the living body is determined; and when the characteristic values of the external face images accord with characteristic values of built-in face images, the external face images pass through the identification of a face identification customs control system. Accordingly, the problem that the face identification customs control system is deceived by face photos can be solved, and thereby only living bodies can pass the face identification customs control system.