Since blind zones and overlaps exist in the traditional digital channelization model， it is hard to meet the requirements of total probability detection in modern electronic reconnaissance receiver. This paper proposes a overlapping digital channelization model. The processed signals are joint together seamlessly in the frequency domain， and the detection of cross channelization signals becomes possible. The proposed algorithm is simulated and tested by real data. The results demonstrate that the proposed algorithm is high efficient， and can be applied to the place of total probability detection for non-cooperation signal receiving.