The invention discloses a method of suppressing Doppler dispersion spread by multiband Chirp in moving target detection (MTD). A multiband Chirp signal receiving system and a method of processing the received signal are included. Through introducing a scale change factor am related to carrier frequency fc in the MTD processing module, target Doppler information in different subcarriers is located in the same frequency point after MTD processing, and through processing the signal, the Doppler spread problem caused by introduction of a multiband structure is solved. The method only needs to change an MTD processing core, no other signal processing modules need to be added, and the complexity is thus low and the portability is flexible.