Air seeding is one of the most important vegetation restoration patterns, so the study of soil quality and its management was valuable to the practice. In 2000, five different thinning intensities of 0% (CK), 30% (slight thinning), 48.75% (middle thinning), 53.75% (intense thinning) and 77.13% (super intense thinning) were carried out in the 9-year-old aerial seeding Pinus tabulaeformis stands with initial density of 8 000 trees/hm2 in Wangjiapu Aerail Seeding Center, Yanqing Country of Beijing municipality. After five years of thinning treatment, the soil physiochemical properties, soil enzyme and soil tnicroorganisms of the 0--20 cm soil layer in the stand and Spiraea pubescens shrub were compared horizontally. Also, effects of different thinning intensities on soil quality were compared vertically to prove the feasibility of thinning as a sustainable development method to aerial seeding P. tabulaeformis stands. The results showed that the soil physical properties, soil nutrient, soil enzyme activities and the number of soil microorganisms in the stand were inferior to the S. pubescens shrub. Therefore, it was seen that the soil of the stand tends to regressive succession. Therefore reasonable thinning intensity was necessary and benefit to the sustainable development of the stand soil. Generally, when the stand with initial density of 8"000 trees/hm2 grows up to 9 years old, the reasonable thinning intensity should be about 48.75%. Compared with soil physicochemical characteristics and soil nutrient, soil enzymes and soft microorganisms were more sensitive to thinning intensities. Among them, soil alkaline phosphatase, capillary moisture capacity and actinomyces could be regarded as indicators to assess soil quality.