Study on Forest Fire Danger Forecast System and Its Operation in China Changes of Forest Fire Danger and the Evaluation of the FWI System Application in the Daxing’anling Region Study on Forest Fire Danger Foreca st and Relea se System Ba sed onDynam ic Da ta Dr iven Applica tion System in Be ijing Prediction on the changes of forest fire danger rating in Great Xing’an Mountain region of Northeast China in the 21stcentury under effects of climate change. Fire Behavior and Consumption of Fuel Loadings in Spring Season in Southern Daxing‘an Mountains FORECAST METHOD OF FOREST FIRE DANGER GRADE IN THE CENTRAL AREA OF YUNNAN