Wireless power transmission system has been developing rapidly in recent years, and its application is becoming more and more extensive. In order to enhance the stability of the system operation, the communication module used in the transmitting and receiving terminals must be added to the system operation. The paper realizes the receiver and the transmitter chip to execute the signal transmission, which is different from the power transmission. Adopts the appropriate circuit design, the inband WPT system can be more stable and practical applying to various instruments of the wireless power transfer system.