Persian Sign Language as a visual/ spatial language is still in its developmental stage. This language has a special linguistics structure and like other sign languages, it is different from its surrounding spoken language. PSL has some options to show aspectual meanings. In this paper, we consider one of the most common aspectual form (completive aspect).Like other sign languages, PSL signers use FINISH to show the perfect aspect.This lexical marker occurs after the main verb with the grammatical function of indicating that the action described by the verb was completed before the time of utterance.