Deepfertilization liquid fertilizer applicator with high efficiency, low price, easy operation and environment protection attracts more and more concerns, which can decrease fertilizer volatilization and increase crop yield and quality. Aiming to explore the influence mechanism that working parameters of pricking hole mechanism with crop damage rate，hole size and hole distance, a new type of non-circular gears planetary system of pricking hole mechanism for oblique type of liquid fertilizer applicator for deepinto type was designed. Through coupling part let pricking hole mechanism meet prick hole condition for oblique type, to make the trajectory of pricking hole mechanism side and ridge side reach the changes of different angles, it was achieved to prick hole for oblique type based on the above conditions. Kinematics model was set up, the influence relationship was obtained between the goals and working parameters. Testbed experiment of working parameters was carried out. The design of quadratic regression rotational quadratic orthogonal experiment was used, with the speed of planet frame, the forward speed and oblique angle as the test factors, the hole mouth width, the hole distance and the rate of crop damage as the test optimization index. The optimization of response surface method was used. Experimental data was analyzed by DesignExpert software so as to establish the regression equation and obtain the diagram of response surface. Test results showed that when the speed of planet frame was 75.0r/min, the forward speed was 0.48m/s and the oblique angle was 23.3°, the hole mouth width was 40.2mm, hole distance was 220 mm and rate of crop damage was 0.33%, the performance of mechanism was optimal under above conditions. The test was verified by applying these parameters to validate its rationality.