Abstract: In order to further enhance the forest fire danger rating forecast and provides new ideas for national forest fire forecast, the paper combined the fire weather level and forestry investigation division constructing the Inner Mongolia forest fire danger rating, This method changes the only based on fire weather divided the forest fire danger rating in the past, add the species composition, burning agricultural population density, and road network density and fireproof period meteorological elements, etc. Completed the meteorological elements and underlying surface forest resources, completed the fire weather level in the forestry investigation division redistribution. The result indicated that in Inner Mongolia forest Ⅲ stage area the actual forest fire forecast should up a level, Ⅲ stage area should down a level. There was no forest resources distribution and combination area should down two level.