In the system of space camera using CCD as the sensor, the matching design of signal processing circuit with the CCD sensor is crucial, and the performance of whole space camera is determined, so the matching analysis should be done after the design of CCD signal processing circuit is finished. Firstly, the typical structure of CCD signal processing circuit in space camera is introduced; then, the analyzing method of matching is proposed based on dynamic range; finally, this method is used in one space camera project and found some not suitable design in the circuit, the basis and suggestion of optimization in circuit design is provided.