Cogent Automatic Fingerprint Identification System (CAFIS) could filtrate and match fingerprints features automatically by computer to search for similar fingerprints, which were identified by specialists finally, in order to providing help for criminal cases. In this paper, the principle, fingerprint identification process and the system workflow of CAFIS were introduced firstly. Then, the five functions modules contain image acquisition, screening, feature matching, scoring and sorting was focused on; and the algorithm of feature matching was introduced briefly. The results of experiment show that the CAFIS has advantages in capacity of database, matching speed, accuracy, etc.