Abstract: The number and structure of regenerations of Abies faxoniana under mixed A. faxoniana and Betula spp. forest were measured and analyzed through representative sampling and field measurement method. Effects of thinning birch (CK, S1 and S2 respectively means thinning birch off 0%, 25% and 50% of the total volume of birch in forest) were analyzed on natural regeneration of A. faxoniana under A. faxoniana and Betula spp. forest. The result showed that thinning birch increased tree DBH (diameter at breast height) area and basal diameter of A. faxoniana seedlings significantly; Survival rate and height of A. faxoniana seedlings were improved by S2. After thinning birch, the structure of diameter class of A. faxoniana seedlings had little change, but the proportion of trail grade seedlings had a trend of increasing.