The work aims to research the mechanism and law of jet forming for the electrohydrodynamic near-field direct writing and explore its influencing factors. Firstly, theoretical analysis on the jet forming mechanism of the electrohydrodynamic near-field direct writing was carried out, and the mathematical model was built. Then, with polyoxyethylene (mass fraction of 13%～17%) as simulation material, which was prepared by deionized water (as solvent), the finite element numerical simulation method was used to carry out experimental verification. Under the action of electric field force, droplet would be subject to flowing deformation and form a meniscus. With the increase in the electric charge density, the meniscus gradually formed the Taylor cone. With a further increase in charge density, electric field force overcame the surface tension of the liquid, and jet flow was generated at the top of Taylor cone. Parameters, such as voltage, jetting height and inlet pressure, would affect the jet pattern. The larger the voltage or the lower the jet height, the greater the electric field force of the jet flow. The greater the inlet pressure, the longer the Taylor cone. The jet pattern can be improved by adjusting the process parameters. The electrohydrodynamic near-field direct writing can achieve the high-resolution ink-jet printing of polymer solution.