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In order to further explore the effectiveness potential of the inclined opposite disk side throwing device in the aspects of throwing uniformity and throwing distance, the shooting flow shape was described qualitatively and quantitatively by using the parameters such as the angle of shooting, scattering angle, and effective throw distance, etc. Through the theoretical analysis, the mathematical models between each parameter and the structural parameters of the throwing device were established. Then, through these models, it was obtained that factors such as the speed of the discs, the inclination angle of the discs and the shape of the scraper had an influence on the shooting flow shape. Based on the simulation results, the wide bottom extended inclined quadrilateral fertilizer scraper, throw-off angle control baffle and other parts were innovatively designed, and the ejection effect of the shooting flow was tested by the prototype test. The results showed that when the height of the throw-off angle control baffle was 140mm and the leading out angle of the upper deflector was 40°, the throw-off angle of the shooting flow can be controlled at about 30°, the innovative design of wide bottom extended inclined quadrilateral fertilizer scraper can reduce the scattering angle to 25°, a narrow shooting flow was obtained to reduce the upwind side of the shooting flow, and the effective throw distance was 11.6m. Under the joint action of this part and the throw-off angle control baffle, a flexible cylinder without guide obstruction was formed, and the throwing effect was better. The research effectively controlled the shooting flow of the spreader by innovating components and optimizing structural parameters, it provided theoretical basis and basic data for improving the operation ability of the side throwing device with inclined opposite discs.