The one-meter infrared solar telescope developed now is the only horizon vacuum solar telescope in China，the science case is fine spectrum analysis (including the Stokes parameters analysis) and spatial-temporal fine structure study of solar activity region magnetic field。considering that，a prolonged and high-precision tracking system is required (0.3 arcsec/30 seconds, 1 arcsec/10 minutes)。 The Auto Guide unit system is a key control technology for large and medium-sized telescopes，in order to implement closed-loop control of the telescope，firstly，we should have high-precision sun-image offset detection，through the full-disk image cross-correlation algorithm、local image cross-correlation algorithm、centroid algorithm、center algorithm based edge detection to achieve，but exist field rotation in the offect，using the software method to elimination the image-rotation. secondly，should provide stabilization and high-precision feedback control algorithm this thesis built the control system model and then design PID controller to enhance the stability and tracking precision。 In the first chapter the content、key-point、difficulty and situation around home and abroad are described。In the second chapter ecxellence and disadvantage of four image-detection are analysised，we can choose appropriate algorithm according the actual observation condition，and then derived image-rotation formula。In the third chapter，the control system model of AGU is built，and then design PID controller to enhance tracking precision，and analysised the system's performance。we introduce the optical system、menchanical system and software system of Auto-guide unit system in the forth chapter，the last chapter sum up the thesis research and develop the new direction for further prospect。
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