Merremia boisiana was identified as a kind of harmful biology of forestry by State Ministry of Forestry in 2005. Based on the rule of pest risk analysis (PRA) of international standards for pest measurements (ISPM) and the relational model of PRA, the paper dealt with the quantitative and qualitative analysis of the risk level of M. boisiana in China from five aspects: distribution, possibility of immigration, stablishment and spread, potential damaged degree, economic importance of affected object and risk management difficulty.The comprehensive risk value (R) was 1.9, which has reached the level of quarantine pest of imported plants in China,belonging to middle dangerous level.
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