The laser scanning intensity is an attribute of point cloud. It is the optical power of echo from laser to target and can reflect the surface properties of the target. The surface properties of Phyllostachys edulis depend on its physiological growth characteristics. We analyze the information of laser scanning intensity of Phyllostachys edulis, model the relationship between trunk No. and laser scanning intensity for Phyllostachys edulis with different ages, compare the root mean square error between the fitting and measured laser scanning intensity so as to distinguish the bamboo age and verify accuracy of the constructed model. The results show that there is significant difference in laser intensity of bamboos with different ages and in different trunks, while the difference is not significant in laser intensity of bamboos in the same trunk. The distinguishing accuracy over 92.5% is realized. The polynomial model can efficiently distinguish Phyllostachys edulis age, which is helpful for estimating its biomass by three-dimensional terrestrial laser scanning.