The equations of displacement, velocity and acceleration of sevenlinkage vegetable seedling transplanting mechanism were deduced. An aided analytical and simulation program was compiled by Visual Basic 6.0. The influences over the kinematics characteristics of the mechanism by some important parameters were analyzed by this program. The length of one of the two driving cranks had significant influence over the trajectory height of the transplanting tip, while it had little influence over the trajectory shape. The length of the other crank had significant influence over the trajectory height of the transplanting tip and hole size. The phase difference of two cranks had significant influence over the trajectory height of transplating tip and trajectory shape. According to the influences of these parameters, the results were analyzed. A group of preferable mechanical parameters were obtained by this program, whose corresponding trajectory and posture could meet the demands of vegetable transplanting.