Based on the data of the ninth continuous inventory of forest resources in Guangdong,the single-element diameter at breast height (DBH)model was used to calculate the biomass of arbor forest in the Pearl River Delta.The carbon storage per plant in the arbor forest was calculated by the carbon content coefficient of trees.The biomass and carbon storage of the arbor forest in the sample plot were obtained from statistical summary.The biomass per hectare in the Pearl River Delta was 61.52 t/hm²,and the carbon density was 29.95t/hm².In terms of the forest stands,the middle-aged and young-aged forests were dominant,the near-mature and mature forests had higher biomass and carbon density per unit area;The species of Schima superba,Pinus massoniana,Quercus,mixed broadleaf forests and mixed conifer and broadleaf forests had higher biomass and carbon density per unit area,while the Eucalyptus was lower;The spatial distribution pattern of biomass and carbon storage were high in the east and west and low in the south;And the biomass and carbon density per unit area increased with the increase of altitude.The sustainable carbon sink potential of arbor forests can be improved by adjusting the age structure,optimizing the tree species composition,strengthening the tending of young and middle-aged forests,and forest protection,which can provide guidance for the construction and promotion of forest city cluster in Pearl River Delta.