Infrared detectors have diverse applications in the defense and aerospace fields ,and they rely on low-noise readout circuits for acquiring useful and clear infrared images. Detectors operating under high-background and weak-signal scenarios encounter issues such as substantial noise disturbances ,uneven signals across elements ,and unreadable signals. To satisfy the requirements for the application of infrared detectors in aerospace engineering in China ,we designed a novel low-noise readout circuit based on the traditional capacitive transimpedance amplifier ( CTIA) in this study. The circuit design utilized autozeroing technology and a new correlation double-sampling circuit with excellent noise suppression capability. We applied the proposed circuit to signal readouts in common midwave line-array infrared HgCdTe spacedetectorsand otherlow-and normal-temperaturedetectorswith operating temperatures within77~ 300K. Further ,we performed simulation verification ,followed by the tape-outof a 10× 1 line-array readout circuit using a 0. 35μm 5 V CMOS process. Our results showed a total output noise of 72. 1 μV ,which was 44. 7% lower than that of the traditional CTIA circuit.