In order to improve the measurement precision and antiinterference performance of the tricolour linear CCD measurement system while ensuring the processing speed, kinds of signal processing methods were summarized and tested in this paper, and new optimization method were proposed. This paper introduced the character of the linear CCD sensor and its driving circuit. Emphatically analyzed the CCD signal processing in the measuring system, showed the CCD output signal feature, voltage division comparing circuit and micro control unit sampling sequence. Experiment results turn out that system processing speed, precision and antiinterference capability have significantly improved. The optimization design begins to use in position controller in printing industry.