As we know that the flow and press pulsation for general gear flow-meter is big, and the shortcoming has been overcomes with difficulty. The article started from the analysis of Instantaneous flow characteristics for general gear flow-meter, with the control variables method, relationship between the number of gear teeth and flow pulse rate was studied was studied. The rule was disctiVered that while gear's number of teeth is bigger, the flow and press pulsation for general gear flow-meter is less. The paper conducted the simulation research on instantaneous flow characteristics for general gear flow-meter. The results show that: while z(1)=z(2)=30, the flow pulsation rate equals 7.05%. While z(1)=z(2)=8, the flow pulsation rate equals 24.45%. While z(1)=19, z(2)=14, the flow pulsation rate equals12.73%. This research has provided the theoretical basis for the gear flow-meter's design.