The invention discloses an integrated design method of a coherent responder, which aims to provide a method of reducing the number of frequency conversion times in multi-forwarding ratio coherent responder by using the characteristics of an analog-to-digital converter and a digital-to-analog converter, and achieving RF front-end integration by combining a method of precise digital frequency correction so as to improve the integration degree. The method is implemented according to the following technical scheme: band-pass sampling is carried out within the frequency range of the analog-to-digital converter to replace intermediate frequency down-conversion, and a high-order frequency component of the digital-to-analog converter is utilized to replace intermediate frequency up-conversion at the same time so as to simplify the frequency conversion process; and furthermore, RF local oscillators of multiple transmitting and receiving channels with different forwarding ratios are unified by combining the method of precise digital frequency correction, and multiple RF front-ends are enabled to be shared, so that the implementation of the multi-forwarding ratio coherent responder is simplified. The method greatly simplifies the hardware design of the responder, the architecture is universal, and the integration degree of the multi-forwarding ratio coherent responder can be significantlyimproved.