Abstract:To find a uniform solution for evaluating the risk of urban greening pests, we introduced idea of pest risk analysis (PRA) to urban greening ecosystem and set up a model for analyzing the risk level of the pest. Based on the rule of international standards for pest measurements (ISPM), fuzzy mathematics theory and characteristics of the urban greening ecosystem, we discussed the criterion of evaluation and calculation measures of the model on the method of AHP and Delphi. Using this model, 16 species of insects and 7 kinds of plant diseases in Shanghai greenbelt was evaluated. The result showed that the high risk level with the value from 0.6 to 0.8 involved 3 species of insects, such as Zeuzera coffeae, Dasychira pudibunda et al and 4 kinds of plant diseases, such as Cercospora sequoiae, Sphaeropsis sapinea et al. The middle risk level with the value from 0.4 to 0.6 involved 9 species of insects, such as Adoxophyes orana, Cyrtotrachelus longimanus et al and 3 kinds of plant diseases, such as Melampsora rostrupii, Ustilago striiformis et al. The low risk level with the value from 0.2 to 0.4 involved 4 species of pests, such as Aceria osmanthis, Parthenolecanium corni et al. Finally, the strategy of the risk management for these pests was discussed.