Tunnel is an important railway operation facility, and its settlement control is vital for railway operation safety. Taking Jing-Guang high-speed railway as research object, based on existing hydrostatic leveling remote automatic technique and laser remote monitor technique, a novel base-bed settlement monitor scheme, i.e. machine visual monitor scheme was proposed, which had overcome the contradiction between accuracy and cost with plane light source and image recognition technology, and realized precise monitor of high-speed railway base-bed settlement.