Metal additive manufacturing technology is growing rapidly and expected to play a key role in design and manufacture of aerospace component， which is attributed to its ability of personalized customization and advantages of forming complex components. However， there is insufficient technical maturity in additive manufacturing stability， real-time quality monitoring， real-time process adjusting in the recent process of additive manufacturing. To solve these problems， the research of metal additive manufacturing monitoring and control technology is summarized from three aspects： Process monitoring， parameter optimizing and closed-loop control. Meanwhile， the necessity of intelligent control of process parameters/sensor data/forming quality in additive manufacturing of high-performance metallic components is demonstrated and future research of process monitoring technology in metal additive manufacturing is suggested.