Objective: The present study explored the outcomes of a positive youth development (PYD) program entitled "Project P.A.T.H.S." based on a total of 12,281 Chinese adolescents in Hong Kong. Method: To understand the impact of this program, the study assessed the changes in developmental outcomes using a single group pretest and posttest design. Results: Findings showed that the participants displayed positive changes in PYD attributes, life satisfaction, and thriving after joining the program regardless of the program content. Conclusion: In conjunction with other studies, the study demonstrates the benefits of PYD programs in promoting positive development in Chinese adolescents.