In this paper,a high dynamic range ROIC for short wavelength infrared focal plane arrays are presented.A capacitive transimpedance amplifier structure is used for the input stage.By time multiplexing the pixel op amps in the odd even rows as comparators,the conversion gain of each pixel can be individuallyswitched and adaptivelyadjusted according to the background radiation,and the modules such as integrating capacitors,sample and hold circuits,and source followers in the pixels are shared by the odd even pixels to save the area and improve the freedom of pixel design.This structure increases the full well capacity,reduces the equivalent noise charge number,and improves the dynamic range without increasing the pixel area.The pixel array size of the readout circuit is 64×64 with a pixel pitch of 30μm,and the simulation results show that the readout circuit has a noise charge of 57.8 e -,a full well capacity of 12.5 Me-,a dynamic range of 106 dB,and a readout rate up to 10 MHz.