Abstract: With natural Vitex negundo community as a research object in Beijing mountainous area, such site factors were selected as slope, aspect, slope position, altitude, soil depth, soil texture, soil type and bare rock ratio and quantification theory I was used to research the influence of different site factors on Vitex negundo community's growth. The results showed that those factors like aspect, slope position, altitude, soil depth, soil texture and bare rock ratio had influence on Vitex negundo community's high growth and such factors as aspect slope position, slope, soil texture and bare rock ratio had influence on Vitex negundo community's diameter growth. The research provided theoretical basis for restoration of degraded vegetation in Beijing mountainous area.

Key words: Vitex negundo, site conditions, quantification theory I, Beijing mountainous areas