Abstract: Land leveling with the control of laser technology is an accepted method with the highest accuracy among the land leveling techniques at present in the world. It is an important way to increase the land irrigation quality, improve the crop seedbed conditions, actualize "fine agriculture" and build modern agriculture of land irrigation. Based on fuzzy control theory, a set of control system for the laser-controled land-leveling machine was developed with high precision and efficiency, low price, simple operation and excellent matching with the middle power tractor in common use in China. It has been testified through experiments that the new hydraulic control device had perfect dynamic characteristics and stability. The unloading pressure of the hydraulic control device is 0.4 MPa, and the rising delay time of the leveling spade is 80ms and the falling delay time is 44 ms. It has no static sedimentation. The leveling precision is up to 2.5 cm and operating efficiency is 0.81 hm²/h.