The occurrence of forest fires is impacted by many factors, such as vegetation type, weather conditions, human and topography. This research utilized the 1965~2002 lightning fires historical data in Huzhong, 1981~2000 forest fire data in Heilongjiang province and the vegetation distribution map, we studied the SOC (self-organized criticality) of lightning fires and SOC of the forest fires in different vegetation type. We studied the scale invariance and robustness of SOC in different scale and different veg...