According to the working principle of the highorder elliptic gear flowmeter, its model was established and the transmission characteristics were analyzed to verify the correctness of the design and modeling method. The calculation formulas of the theoretical average flow rate and the instantaneous flow rate of the flowmeter were deduced according to the rotation position relationship of the elliptic gear pair. The influence of the order and eccentricity on the instantaneous flow rate was discussed through drawing the flow curve. According to the pulsation characteristic of the flowmeter, the pulsation suppression scheme was designed to eliminate the flow pulsation and make the output flow constant. Then, the simplified twodimensional diagram was imported into Fluent for numerical simulation, and the velocity field and pressure field in the elliptic gear flow meter were obtained.The results show that: the change of the eccentricity will change the instantaneous flow of the elliptic gear flowmeter; the flow pulsation can be eliminated by adding a pair of variable speed noncircular gear pair; the generated pressure and velocity cloud map reflects the real situation of the oil in the cavity, which proves that the model is correct and feasible without interference.