[Aim] Vatica mangachapoi is the national Ⅱ class protected plant. Hainan V. mangachapoi forest nature reserve is one of the two largest coastal V. mangachapoi forest in the world. In 2020, it was found that Massicus venustus seriously endangered V. mangachapoi in the reserve. Therefore, it is necessary to analyze the risk level of M. venustus to V. mangachapoi in Hainan.[Method] The risk of M. venustus to V. mangachapoi in Hainan Province was evaluated qualitatively and quantitatively using pest risk analysis procedures and methods on five aspects, including distribution, potential economic hazard, the economic importance of the host, possibility of colonization, and risk management.[Result] R-value of risk index evaluation system of M. venustus was 2.05, indicating that it was a high dangerous pest.[Conclusion] M. venustus severely impacts V. mangachapoi in the nature reserve. It is necessary to conduct risk management on M. venustus from the aspects of quarantine management, prevention, control technology research, and basic research of bio-ecology.