Based on field investigation,biomass and carbon density of forest communities in Shanxi Huoshan Mountains were estimated by using the biomass expansion factor(BEF) continuous function method and its distribution pattern and influence factors were analysed.Results showed that the average unit area biomass and carbon density of forest communities in Shanxi Huoshan Mountains were 58.00 t/hm~2and29.46 t/hm~2.The average unit area biomass(62.35 t/hm~2) and carbon density(31.17 t/hm~2) of Quercus wutaishanica for...