Geostationary Interferometric Infrared Sounder(GIIRS) is an important payload of the FY-4 meteorological satellite. It is used to obtain a variety of three-dimensional information of the atmosphere.An infrared focal plane array(IRFPA) readout integrated circuit(ROIC) for GIIRS was successfully designed in this paper. The circuit choosed CTIA as the input stage, and had four levels of charge capacity. The working modes is flexible, and the correlated double sampling (CDS) structure was used to reduce circuit′s output noise. The circuit was fabricated with CSMC 0.5 μm 2P3M 5 V process. The test results of the circuit have met the expectations of the design. The circuit′s output noise is lower than 0.14 mV, and dynamic range reaches 85.6 dB. The circuit has been hybridized to MWIR HgCdTe detector and the test results show that the IRFPA works normally. The IRPFA′s output noise is lower than 0.43 mV, and dynamic range is above 75.6 dB. The IRFPA meets the requirements of the GIIRS.