With the development of the information age, people need to disclose personal information in exchange for socializing and related services. At the same time, people's privacy concerns are gradually increasing. Privacy paradox has become a normal phenomenon in social network sites (SNS). The loss of control of privacy might lead to privacy fatigue. Previous work has studied the mechanism of privacy paradox and explored the influence of specific factors on privacy paradox. However, the effect of privacy fatigue on privacy paradox among SNS users has not been studied. In this study, we use structural equation modeling (SEM) to explore the effect of privacy fatigue on personal information disclosure intentions and actual behaviors among WeChat users. Our results of 710 participants showed that privacy fatigue has a mediating role between privacy concern and privacy disclosure intention, and has a positive influence on privacy disclosure intention and disclosure behavior. Based on these results, we provide implications to reduce privacy fatigue and privacy paradox.