Abstract: Macro fiber composite (MFC for short) is a new type of piezoelectric fiber composite material. Devices made of MFC are both sensors and actuators. With a d₃₃ mode MFC actuator as an example, the piezoelectric constitutive equation of MFC is given. Advantages and disadvantages of three methods for preparing piezoelectric fiber sheets are summarized and compared. Finally, the current status of MFC application is illustrated by listing the actual application cases of MFC actuator in different fields. The application and development prospect of MFC is presented.