Aimed at the problem that large CNC hobbing machine encounter creeping at low speed, a semihydraulic unloading and composite guide technology was put forward. The working principle of the column hydraulic unloading introduced, and the mobile location factors of CNC hobbing machine (X axis) was analyzed.The result shows that the mechanism can reduce the difference between static and dynamic friction when machine tool column moves, which provides an effective method to solve the problem of low velocity crawling in large machine tool.