Since 2012, a large-scale Party branches building campaign intending to regain political influence in the private sector has been sweepingly promoted. Drawing on the Chinese Private Enterprise Survey conducted in 2008, 2012, and 2018, this study investigates private enterprises’ strategies in response to the intensified political pressure by integrating socioemotional wealth theory and neo-institutional theory. It is found that (1) private enterprises with high family ownership tend not to establish Party branches until political pressure is very high; (2) enterprises with high family ownership are more likely to adopt a decoupling strategy of evading the Party's political and social goals; and (3) the owners’ perceptions of a better market and legal environment weaken the negative effect of family ownership on the establishment of Party branches. These results reveal the key logic of preserving the socioemotional wealth and ‘embedded agency’ of Chinese private enterprises when they confront institutional legitimacy mandates. This study also sheds new light on the causes of the decoupling phenomenon and the dynamic interactions between institutional environment and organizational behaviors.