Abstract: This paper deals with mathematical models of culm forms of Phyllostachys pubescent. Based on 2,761 culms collected from 13 districts located in China and Japan, fourteen mathematical models have been worked out by statistical procedures. They are:1, The distribution of intercede lengths of culms:2, The distribution of internode cireumfernces of culms:3, The distribution of internode radial wall thicknesses of culms:4, The distribution of internode. yolumes of culms:5, The structural model of the relative diameters of culms (D%): 6, The structural model of the relative radial wall thicknesses of culms7, The structural model of relative fresh weights of culms (W%):8, The relationship between the culm breast-height diameter (D) and the culm length (H) which is dependent on the annual mean temperature (t) and rainfall (R):9, The relationship between the breast-height diameter (D) and the fresh weight (W) which also depends on the annual mean temperature (t) and rainfall (R):10, The relationship between the breast-height diameter (D) and the clear length (Hc]) which is dependent on the annual mean temperature (t) arid rainfall (R):11, The relationship between the breast-height diameter (D) and the total fresh weight of branches with leaves (Wbl) which also result from the annual mean temperature (t) and rainfall (R):12, The relationship between the diameter (D) at breast-height and the diameter (Dx) at any height:13, The relationship between the breast-height diameter (D) and the radial wall thickness (Zx) at any height:14, The relationship between the breast-height diameter (D), the length (H) and the total fresh weight (W) in connection with the influence of annual mean temperature (t) and rainfall (R):