Abstract: In order to study the rheological characteristics of nano-meter silver passing through the jet printing channel under influence parameters, the numerical simulation for dropping process of nano-meter silver under different conditions is carried out by COMSOL software in this paper. A two-dimension axisymmetric geometric model is established based on the spraying and printing process of nano-meter silver , the laminar flow and electrostatic physical fields are set, and the dynamic viscosity, surface tension, transverse electric field and dielectric constant are selected as influencing parameters. The results show that with increase of dynamic viscosity, the maximum speed of nano-meter silver increases and its width & length dimensions change obviously; that surface tension coefficient has significant effect on the maximum velocity of nano-meter silver, while the influence of dielectric constant and electric field strength on the rheological characteristics of nano-meter silver is not obvious. Therefore, dynamic viscosity and tension coefficient are more important to the rheological proper- ties of nano-meter silver.