A diversity combining method applied by a receiver in a wireless communication system is provided, including: acquiring baseband signals of receiving channels corresponding to multiple receiving antennas, and combining multiple acquired baseband signals according to a Maximal-Ratio Combining (MRC) principle at an intermediate frequency and/or within an equalizer and/or after the equalizer. Further a receiver in a wireless communication system is provided. By means of the technical solutions of the disclosure, it is possible to improve a demodulation threshold and the demodulation sensitivity of a microwave system.