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This article introduced a monitoring system, which used to collect and transmit downhole flow rate. Typical separating injection well needs to monitor injected water volume of each oil layer and measure parameters such as pressure and temperature. This monitoring system is designed based on principle of the venture meter and 485 bus communication. It by way of monitoring pressure difference in between inlet and outlet of the venturi meter, with measured pressure difference and tube size of the venturi meter, applied energy equation (Bernoulli Equation and continuity equation) to calculate the real time flow and time integral algorithm to calculate the total flow. Then data will be send to surface measuring and controlling computer. This system has benefits such as real time data sending, high accuracy data collection, anti-interference ability, compact-sized. The experimental results showed that this system satisfies the requirements of measuring real time downhole parameters such as flow rate within injection well.