30%。The results of the recent separating-lanting mechanism were first taken into consideration. This mechanism increased its rotational speed to improve its operational efficiency; yet by increasing the velocity of the needle of the separating-lanting bar, it increased the seeding injury rates at the same time. As a result, a newly designed mechanism, as well as studies on its affect on the survival and growth of rice, was introduced. The new type of separating-lanting mechanism had three separating planting bars with an elliptic plant gear system of high-erformance rice transplanters. Adding an additional separating planting bar kept the high operational efficiency of the rice transplanter while slowing the rotational speed to decrease seeding injury rate. Its kinematic model was established on the basis of transmission analyses of planetary elliptic gears systems; 3-D models were established by SolidWorks and the kinematics simulation was analyzed by ADAMS. Under the condition of the same operating efficiency, the speed decreased by 30%.