Abstract: Terrain, vegetation type and residential area are selected as influencing factors. The ArcGIS10.3 software is used to classify fire risk levels in Anning city. Based on the level of fire risk, prescribed burning reconnaissance in Anning city is researched in consideration of river, transportation and the distance from firefighting forces. The research shows that Anning city is divided into five fire risk levels, namely, lower risk level, low- risk level, high- risk level, higher risk level, and extremely high-risk level, accounting for 41.75％, 3.6％, 19.66％, 4.53％, and 31.46％ of the total area of Anning city respectively. Areas with the high fire risk level and above account for a large proportion and are highly prone to forest fires. The areas below the low- risk level are mainly distributed in river distribution areas, inflammable tree species distribution areas, and sparsely populated areas, which are concentrated in the north of Anning city. The areas above the high risk level are mainly distributed inflammable tree species distribution areas, areas with an altitude below 2 000 m and densely populated areas, mainly in the south of Anning city. The ignition priority for prescribed burning in Anning are highest risk areas, higher risk areas, high-risk areas,low- risk areas and lower risk areas successively, occupying 31.46％, 4.53％, 19.66％, 3.6％, 41.75％ of the total area of Anning city respectively. The priority is to burn the southern region,then the northwest region, then the eastern region, and finally other areas. The research results are able to provide technical support for forest fire prevention and prescribed burning of other areas in southwest China.

Key words: prescribed burning, fire rating, buffer analysis, selection