A direct insert corn planting device with whole plastic-film mulching was designed on double ridges in dry land. The horizontal absolute velocity of hole-former was made zero at seeding time by using cam and crank combination mechanism to control it. The direct insert planting device was simulated to measure the hole-former’s displacement, velocity and acceleration, with the cam designed based on relative path curves in the ADAMS/View. The simulation results showed that the seeding device met the requirement of design. 