This paper introduces a new auto-tracking and guiding system

which is based on mass-center algorithm and large CCD-Array with Full Solar Disk Image. It uses an Embedded System with high speed processing ability to compute and process mass-center data and all CCD image is dealed with binarization process. Compared with the previous one

the new system can largely reduce the cost and complexity and it enhances the accuracy of the tracking system and reduces the dependency of weather condition. It also constitutes a high-precision closed-loop tracking system. According to the analysis of the experimental data

the new auto-tracking and guiding system achieves the precision of during one hour observation. This system is also a concept experiment for Space Solar Telescope (SST).