A new-style transplanter’s planting mechanism was designed, which was composed of Planetary Gear, Planetary Carrier, Connecting rod, Groove cam and Planting arm. Built the kinematics model and determined the main parameters which influenced the Plant-arm’s locus by analyzing of the Kinematic model. Created the 3D Model in PRO/E and imported it into the Kinematics simulation software ADAMS, analyzing Groove-cam’s offset angle, Connecting-rod’s length and its impact on the Plant-arm’s kinematics locus. The effect laws of the structural parameters on the Plant-arm’s locus were obtained through analyzing the Plant-arm’s locus, which got by changing the groove cam’s horizontal offset angle ranging from 0° to 20°, the sum of Connecting-rod’s length ranging from 130mm to 150mm, and the subtract of Connecting-rod’s length ranging from 15mm to 25mm. The analysis results are of theoretical significance to the dimension synthesis and optimization design.