In order to study the different kinds of rock plastic characteristics in point load, the determination of granite, sandstone, siltstone, Huang Shayan, Xuan Wuyan, red brick in point loading load-displacement curves were obtained through laboratory experiment, mechanical properties of 6 kinds of rock and plastic characteristics. The strength of siltstone, red brick and basalt is close, and the strength of Huang Shayan, granite and fine sandstone increases linearly, and coincides with the trend of stiffness. With the increase of strength, the deformation presents the characteristics of rapid growth and slow drop. According to the law of curve classification and classification of rock, Huang Shayan, siltstone, Xuan Wuyan and red brick belong to brittle plastic rock, Xuan Wuyan is plastic rock, fine sandstone is brittle rock. Through the plastic coefficient classification of rocks, sandstone for brittle rock, grade 1, plastic coefficient is 1, basalt plastic rock, grade 6, plastic coefficient for 6~ 8, granite plastic