In this paper, the design details of a readout circuit suitable for large spacing dual band short wave line infrared detector are introduced. The input stage of circuit is designed as CTIA, In the analog channel, 11 stage TDI is used to accumulate and average the time delay of the signal. This paper mainly introduces the design and simulation analysis of the signal processing circuit of the input level and the column level, gives the overall simulation results of the whole circuit, and introduces the actual test results of the circuit at the end of the article.