Abstract: In order to solve the problems of low machining precision, difficult control of deposition area and poor uniformity of deposition layer using jet elec-trodeposition processing, the influence of long-hole jet nozzle parameters on deposition area and deposition profile was analyzed. By establishing a system hydrodynamics model, the effects of the oblique angle of the long-hole nozzle section and the length of the nozzle cavity on the flow field in the deposition area were studied, and the contour distribution of the depo-sition layer under the coupling effect of the electric field and flow field was discussed. The simulation results show that with the continuous increase of the oblique angle of the nozzle section from 30° to 70°, the localized range of the deposition liquid at the nozzle outlet can be reduced by about 3 mm, and the localization is significantly improved. With the increase of nozzle cavity length from 40 mm to 80 mm, the fluid velocity, pressure and localization did not change much. The thickness of the deposition layer is the largest in the area directly below the nozzle, and then gradually be-comes thinner symmetrically from the center to both sides. The corresponding nozzle is processed according to the simulation parameters, and the experi-mental verfication shows that the experimental results are basically con-sistent with the simulation results.