Abstract: Abstract：To assess the risk of the invasive pest Hyphantria cunea(Drury), to know its potential distribution and the ratio of occurrence, make great sense for monitoring and controlling. Using GARP (Genetic Algorithm for Rule-set Prediction Modeling ), The article predicted suitable distribution area of Hyphantria cunea (Drury) in China, And the risk of Hyphantria cunea (Drury) in part area of Hebei province was assessed with fuzzy method based on information diffusion principle. the result showed that the values of risk decreased with the increasing of disaster index levels. the potential suitable distribution is from 21.20°N～46.33°N, 97.80°E～132.11°E and 36.81°N～41.85°N, 76.00°E～94.66°E (part areas of Xinjiang). Based on GARP and fuzzy method based on information diffusion principle, assessed the risk of the invasive pest using known distributing data, offering gist for monitoring, controlling and forecasting, have abroad application foreground.