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Abstract： The land leveling technology based on GNSS (Global Navigation Satellite System) can improve the micro-topography of farmland to reduce water usage and increase yields. An automatic navigation system for a GNSS-based and leveling system was developed in this paper, aiming at improving the land leveling efficiency and reducing the working intensity. A steering control system was designed, which consisted of a PLC (Programmable Logic Controller), a motor control module and a steering actuator. Motor drives a hollow rotating platform to control the steering wheel. Meanwhile, the path planning and automatic navigation functions were added into the original land leveling software, which was developed in Visual Studio 2008. The planed path is simple and easy to be implemented on a land leveling tractor. The automatic navigation function controls the tractor along the planned path through the steering system based on the relative position of the tractor to the planned path. The system has been applied fora long-period experiment on Shangzhuang experimental farm of China Agricultural University. The test results show that the tractor could follow the planned path, and the land leveling performance was desirable.