In order to understand forest community structure,species diversity and their changing dynamicsand therefore to provide a reliable basis for effective biodiversity conservation,the natural secondary forest inBeigou forest farm,Weichang County,Hebei Province was selected to investigate forest communities structure and species diversity including Raunkiaer life-form,diversity index,etc.The results showed that thestudy area had vegetation resources of 117species belonging to 58families and 99genera.Phanerophytesdominated in the communities,followed by geophyte,while other kinds of plant showed no obvious advantages.The internal lamellar structure of the community was complex,as dominated by phanerophytes lamellarand in high bud lamellar.The richness index for each plant communities could 0 be ranked in a descending order as herb layer>shrub layer>tree layer.The diversity index differed among different layers.The evennessindex varied significantly between the layers of species,in the descending order as herb laye>shrub layer>tree layer.