Fire has crucial effects on ecosystem succession, the carbon cycle, and atmospheric chemical composition [1-3].Previous studies have shown that fire dynamics are closely related to regional vegetation and climate.Arid Central Asia (ACA) is sensitive to climate change, and grassland fires in ACA account for over 80％ of the total burned area [4].In the face of intense global climate change, it is vital to understand how grassland burning responds long-term to climate and vegetation.Developing such an understanding would help predict fire activity and thus assist in the development of future fire management policies.