Abstract: Fire is one of the major environmental factors in forest and grassland ecosystems. Based on the results of analysing charcoal, pollen and loss-on-ignition (LOI) in 15000 a B.P. sediments in Dongganchi, this paper deals with the possibility of fire occurring since 15000 a B. P. in Beijing. The time series analysis was used to infer patterns of fire as well as relationship between fire and some plants. In the meantime, other factors resulting in fire were considered. In addition, the man’s effect on fire playing was discussed according to archaeological and historical material.