Abstract: In July and August 2022, 30 sample plots were established in Mulanweichang State-owned Forest Farm in Hebei province dominated by Betula platyphylla, Larix gmelinii, Pinus tabuliformis and Quercus mongolica, based on the forest management survey. Investigations were carried out on increment of DBH, growing stock, etc. of sample trees, and forest carbon sink were estimated. The results showed that in 2022, the forest growing stock in the Farm was 833.93×104 m3, biomass was 733.21×104 t, carbon stock was 377.10×104 t, and the carbon sink was 60.33×104 t, with an average annual carbon sink of 12.07×104t·a-1. The four dominant tree species in different age groups had large differences in forest growing stock, and their unit area biomass had differences among different age groups and tree species. The unit area average annual carbon sink was ordered by P. tabuliformis, followed by Qu. mongolica, and L. gmelinii, which indicated that they had high potentials of sequestering and sinking carbon.