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With a large area of forest, Linfen is one of fireprone regions in Shaanxi Province. Using the meteorological and forestfire data from 1986 to 2003, an analysis is made of the relation between forestfire occurrence and meteorological conditions, fire hazard conditions, and forest moisture content. The synthesis forecast index of forest fire risk is calculated, and a synthesis multifactor fire risk forecast equation is established. The application proved that it has satisfactory effectiveness and certain capability of forest fire forecasting and early warning.