Readout integrated circuit is an important component in infrared detector dewar cooler assembly(IDDCA),and its performance has a great significance on IDDCA and the overall infrared imaging system.According to the characteristics and application requirements of different infrared detectors,ROIC should adopt the corresponding signal readout and processing technology to improve assembly performance.Several signal readout technologies were introduced,such as source follower input stage,direct injection input stage,capacitive feedback amplifier input stage,meanwhile,the low noise signal processing technology of correlated double sampling and pixel level digitalization technology were also introduced.