A signature is a certain writing style of a person's name or as a sign of identification and can be used to recognize a person's identity. Currently, the signature identification system has been applied in a number of fields, such as in forensics, psychology, and security. Stages are used in the identification of signatures has three basic stages, the stage of signature data acquisition, image feature extraction stage of the signature, and the final stages of testing the suitability of signatures. Stage signature image feature extraction is a stage that is quite important. At this stage it will look for information that is specific characteristics of each signature. So it can be used as the basis for the identity of a signature. Of these traits, City Block distance method is used to determine the suitability of the test image autograph. Based on the results of the test identification using a different image of the signature using the same person city block distance is obtained 20 images of 24 images successfully identified the success rate of 83.33%.