Abstract: In order to consider the temporal and spatial heterogeneity of hazards, reflect the natural inherent fire risk grade attribute under the action of the disaster-pregnant environment and the hazard-bearing body, and achieve the purpose of dynamically assessing forest fire risks, the geographic information system (GIS) method was used to obtain and process 9 indicators in 4 categories: meteorological factors, topographic factors, vegetation factors, and man-made factors. The analytic hierarchy process was used to determine the index weights. Combining with the current forest fire risk zoning standards, forest fire risk in Sanya City was overlay analyzed and divided. Through comparison with historical fire data, the rationality of the evaluation method was verified. The results showed that the overall forest fire risk level in Sanya is relatively low, and most of them are in the medium and high risk range. High- risk areas mainly range from the first ridge-line which is the north of east and west highways to the south by the coastal area.

Key words: forest fire, analytic hierarchy process, fire zone, space analysis