Using Visual Basic 6.0 software, the kinematics equations of the spray fertilizer needle tip point of fertilizer applicators planetary pricking hole mechanism with congruent elliptic gears was programmed. The y-component image and static trajectory of the needle tip points location was got. Then, according to the fertilizer requirements when spray fertilizer needle buried and distributor’s working principle, the movement angle of distributor’s cam and the motion law of distributor value’s spool were determined. The spool travel was selected as 10mm. The cam’s profile curve was got in VB and the pressure angle and radius of curvature were verified. The Pro/E software was used for 3-D model and kinematics simulation of the distributor and cam. The displacement image, speed image and acceleration image of spool within a movement cycle were got. Each fertilization volume of this device was measured through the test. The results showed that the each fertilization volume reached the required value and meet the job requirement. 