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Aiming at the problems of high labor intensity, low efficiency, poor penetration of traditional plant protection machines, and poor walking stability under narrow row spacing in the middle and late stages of corn, 3YZ-80A crawler self-propelled corn interrow sprayer was designed according to the requirements of corn planting agronomy and pest control in the middle of canopy. The machine was mainly composed of an adaptive profile track differential drive chassis, a Y-type dual-nozzle pulse spray device, and a spray monitoring system, which can meet the space requirements for plant protection operations under the narrow row of corn leaves below 600mm. In order to improve operation efficiency and spray effect, the spray angle, nozzle position, and spraying distance were taken as experiment factors, the volume median diameter D50 was used as the performance evaluation index of spray system, the quadratic rotation orthogonal combination experiment was carried out. the variance and response surface analysis of the data were carried out by using Design-Expert 8.0.6 software, the mathematical regression model between the experimental factors and the indicators was established, and the significant factor was analyzed. The influence change rule of the evaluation index was obtained, and the optimal combination parameters of the nozzle were obtained: the Y-type spray angle was 60°, the position of the liquid nozzle on the nozzle was 0.61m, and the distance between the spray nozzle of the fog machine and the receiving surface was 2.37m. Field test results showed that with the increase of operating speed, the effective prevention and control area of the self-propelled interrow sprayer was significantly reduced;when the range was 0.6~1.1m/s, the droplet coverage was more than 10% effective. The spraying width was 6~8m;when it was greater than 1.3m/s, the effective spraying width with a droplet coverage greater than 10% was less than 4m. The research result can provide technical support for the development and improvement of narrow row spacing plant protection equipment applied to high-stem crops.