[Objective] To explore the carbon storage characteristics of arbor layer, herb layer and litter layer of six different trees of grain for green project in Pingguo County in order to provide the data support for evaluation of forest ecological benefit further. [Methods] Based on the survey of sample plots and mathematical analysis, combining with the basic statistical method, the characteristics of carbon storage were analyzed. [Results] The difference of carbon content between different arbor layers was little. In addition to the Amygdalus persica, the average carbon rates of other species on the ground ranged from 0.49 to 0.52. There were large differences between the various organs of the same stand, and the same situation for different stands. The decreasing order of carbon densities in different stands was followed as: Illicium verum 26.864 t/hm², Castanea mollissima 23.120 t/hm², Eucalyptus 22.863 t/hm², Pinus massoniana 16.686 t/hm², Amygdalus persica 15.393 t/hm², Zenia insignis Chun 9.956 t/hm². The total carbon storage of vegetation layer was 1.4374×10⁵ t. [Conclusion] The average carbon density of arbor layer in Pingguo County was far less than the estimated value in China and other countries.