Subsea chemical injection metering valve is the core chemical injection equipment to ensure the long-term safe operation of the subsea production system and realize the functions of accurate injection and flow metering. In this paper relevant standards for the function and technical requirements of subsea chemical injection are introduced, Then, the subsea chemical injection process is proposed, the installation position and function of subsea chemical injection metering valve are pointed out. Finally, considering the international mainstream subsea chemical injection metering valves, operation principle, power supply and communication, mechanical structure and subsea installation are analyzed. This research can provide somewhat significance for the independent development of our subsea chemical injection metering valve.