This paper develops the noise model of TDI-CCD camera system
analyses generated mechanism of read reset noise of TDI-CCD video signal and the principle of the CDS (Correlated Double Sampling) technique. Every part of the video processing circuit is analyzed and the design methods were presented. The scientific grade TDI-CCD camera is designed according to them. Results show that the designed circuit can effectively suppress dark current noise 、reset noise and 1/f noise.The output S/N (signal to noise ratio) of TDI-CCD camera can exceed 50 dB when the data rate is 50MHz.