Acceptance and Commitment Therapy (ACT) improves mental health by augmenting psychological flexibility. Studies showed that psychological flexibility affects mental health; however, although studies have examined individual aspects of psychological flexibility, few have comprehensively examined an entire psychological flexibility model, especially in China. The Comprehensive Assessment of Acceptance and Commitment Therapy Processes (CompACT) is a comprehensive evaluation method that reflects psychological flexibility. The objectives of this study were to develop a Chinese version of CompACT that fits with Chinese culture and examine its reliability and validity. We studied 4999 non-clinical Chinese civil servants and explored the characteristics of the Chinese version of CompACT. Exploratory factor analysis was used to measure Openness to Experience, Behavioral Awareness, and Valued Action that explained 54.3% of the total variance. Confirmatory factor analysis provided support for the three-factor model. The Cronbach's alpha-coefficient of the scale was 0.87, suggesting that the Chinese version of the CompACT is reliable. The Chinese CompACT total score represents the overall level of psychological flexibility; it is significantly negatively correlated with negative emotions and positively associated with well-being. Our findings suggest that the Chinese version of the CompACT accurately assesses psychological flexibility in Chinese adults.