In order to provide mechanical data for the design of ramie peeling machine，the experiment on tearing parameters of ramie bark fibers was tested by using the homemade fixture on the SANS–CMT6104 microcomputer control electronic universal testing machine. To explore the influence on tearing force between the bast fibers and the xylem caused by the tearing angle, tearing parts and tearing method (unilateral and bilateral reverse tear). The results show that when the tearing angle is between 135°and 180°, the tearing force between the bast fibers and the xylem decreases with the increase of tearing angle, the tearing angle is closer to 180°and the tearing force is smaller. For the same sample, the tearing force of bilateral tearing is almost twice greater than the force of unilateral tearing; the tearing force of different parts is changed slightly for the same plant, and the variation range is about 17%, but the tearing force at the node will increase dramatically.