Abstract: Using 10cm aerial images,based on forest resources surveying,the forest vegetation types and their characteristics were obtained in this paper.At the same time,various topography factors were obtained by the digital DEM.Fire risk indexes were calculated by weighted overlay method and the forest area was divided into five level fire risk zones.They are level Ⅰ(no danger), level Ⅱ(low danger), level Ⅲ(moderate danger), level Ⅳ(high danger),and level Ⅴ(extremely high danger).The result showed that:1) level Ⅰ risk zone had least area quantity that accounted for 3.98% of total study area;2) level Ⅱ risk zone owned largest area quantity and it accounted for 32.25% of total study area;3) level Ⅲ risk zone accounted for 21.05%;4) the ration of level Ⅳ and level Ⅴ was 22.14% and 20.58% respectively,and the sum accounted for 42.72% in entire study area,so fire preventing task was hard in the study area;5) fuel types played an important role in fire risk zone division.Among them,Oak and tea tree played positive action for fire prevention.The distribution area of pine,bamboo and wild grass was very crucial for fire prevention and should be managed and monitored closely.

Key words: Huaguo Mountains of Lianyungang, high spatial resolution, aerial image, forest fire risk zone, topography factors