Signal process system is applied in a space-borne multi-spectral sensor,and it is composed of visual information process circuit and infrared information process circuit. Based on pushbroom imaging,the system adopted external synchronous control to complete some functions of visual,short-wave infrared,middle-wave infrared and long-wave infrared detectors,including sequential control and driving,collecting and processing of analog signals,integration and formatting of digital signals. This system has the characteristics of multi FPA synchronization,large number of analog outputs,high signal to noise ratio. Eventually,the system samples 32 analog video signals,outputs 14bit data and 5 serial LVDS channels by 30 Mbps transmission rate in single channel. Under given test conditions in laboratory,the results indicate that the SNRs of visual and short-wave infrared channel are 307 and 422,meanwhile the NETDs of middle-wave and long-wave infrared channel are 0.14 K and 0.16 K. An imaging experiment in visual channel acquired good image data. The test in laboratory proves that the system can meet the demands of multi-spectral sensor application.