Abstract: This paper deals with mathematical models of culm forms of Phyllostachys pubes-cens. Based on 826 culms collected from 20 sample plots in Yixing, Jingsu in 1980, four basic mathematical models have been worked out through statistical procedures. They are: ’1, The relationship between the bamboo number per mu (N) and the length (H) of culms:H = 0.8459 N0.1745 D0.782, The relationship between the bamboo number per mu (N) and the clear length (Hcl) of culms:Hcl=0.0398 N0.4668D3, The relationship between the bamboo number per mu (N) and the total fresh weight of branches and leaves (Ww):Wbl = 2.5998 N-0.4030 D1.254, The relationship between the bamboo number per mu (N) and the knot number (Nw) of clear culms:Nbl= 1.7228 N0.2661 D0.55, The bamboo number per mu have no influence on the fresh weight of individual culms in Phyllostachys pubescer.s stands.