Abstract: A new technique for bandwidth changeable digital channelized receiver based on multiple detection stages and integration analysis is proposed. The principle of realization and concrete operation flow are designed. The hardware and software construction framework of the system is also discussed. For the incompatible character between bandwidth of sub-channels and receiving sensitivity in a digital channelized receiver, corresponding parameters of the method are designed.Analysis results showed that this method can realize farthest bandwidth matching for signals with different bandwidth, and improve the receiver sensitivity to the greatest extent.