The article is based on micro handed ditcher and it designs fertilization devices and covering soil devices which mainly include the transmitting designment of distributing device,central assignment,covington soil and simulation forms in order to achieve the cooperation of ditching,fertilization and covering soil.It implements the power from the wheel to rows fertilizer,the stability of the centeral point of fertilizer box,the adjustment of fertilizer consumption,covering plate achieving simulation function under this condition which its altitude is around 80 cm . The experimental conclusion in field shows that the speed of fertilization is 50 kg/h, the rate of covering soil is by 78.3% and its degree of uniformity is good.