Abstract: In order to explore the optimized structure and suitable working pressure of the parallel four-channel Venturi jet, and solve the key technical problems in the design and engineering application of the four-channel integrated fertilizer applicator, the paper is based on the FERTIKIT 3 G bypass fertilizer absorption-type integrated water and fertilizer applicator, by adding a fertilizer absorption channel to build a parallel four-channel bypass fertilizer absorption-type integrated water and fertilizer applicator, and optimize the fertilizer absorption structure of its parallel four-channel Venturi jet and simulation. When the inlet static pressure is set to 250 kPa, the installation positions of passage 1, passage 2, passage 3, and passage 4 are indented by 5 mm, 10 mm, 15 mm, and 20 mm to the left, right, and middle respectively. A total of 12 horizontal FloEFD simulation analysis shows that the new structure（OS） of the parallel four-channel Venturi jet with RI4 retracted 20 mm to the right is an optimized structure. The fertilizer absorption capacity of OS is 2 317.20 L/h, and the variance of the fertilizer absorption capacity of each channel is 218.43. All variables are lower than other groups, with the best balance and uniformity. Further study the OS at the inlet pressure of 150 kPa～350 kPa, the total fertilizer absorption is inversely correlated with the inlet pressure. When the inlet pressure is 150 kPa, the maximum amount of fertilizer absorption is 4 300.55 L/h; when the pressure increases to 350 kPa, the fertilizer absorption channel begins to oscillate unevenly; when the pressure further increases to 450 kPa, the fertilizer absorption channel appears back suction phenomenon. Research shows that the suitable working inlet pressure range of the new structure OS is 150 kPa～250 kPa.