The component of fine tracking system for quantum communication is analyzed. The high frame CMOS detector is suit for fine tracking sensor because of the pulse beacon light and the frame rate up to 2.5 kHz by integrative design method. The piezo fast steering mirror is used for fine mechanism. The fine track control loop is analyzed by discrete design and root locus method, with the result of control parameters and system transfer function. The laboratory and outfield 32 km vehicle platform experimental tests are implemented. The accuracy is within ±1 μrad in the static state and ±8 μrad when the platform is moving. By frequency analysis, the disturbance rejection bandwidth is up to 100 Hz.