Abstract: Based on 685 valid leader-subordinate matching samples， this paper conducted an empirical study on how workplace cheating affects organizational citizenship behavior. The result shows that workplace cheating has a negative impact on organizational citizenship behavior. Perceived organizational support plays a mediating role in the mechanism of workplace cheating and organizational citizenship behavior. Task complexity moderates the effect of workplace cheating on perceived organizational support， and the indirect effect of workplace cheating on organizational citizenship behavior through perceived organizational support is stronger under high task complexity. Based on the social exchange theory， this study explores the impact of workplace cheating on organizations， expands corresponding theoretical researches， and provides a new perspective on how organizations respond to the negative effects of cheating.

Key words: workplace cheating; perceived organizational support; task complexity; organizational citizenship behavior