In order to meet the requirement of high-resolution dual-comb spectroscopy for the mutual coherence of optical combs, a method of dual-comb homologous frequency stabilization is proposed, that is, two optical fiber combs are locked on two frequency sidebands of the same phase modulated continuous wave laser. This method makes the two combs have the same optical reference, so there is no need for complex phase correction circuit and ultra-stable optical cavities. The coherence time is greater than 1 s. After experimental verification, this method obtains the comb-line-resolved dual-comb spectrum signal.