Abstract: For the operational use requirements of a certain type of rocket launcher ammunition supply vehicle，an automatic leveling control system based on hydraulic drive is designed.According to the leveling strategy of existing control system，an angle error leveling method is put forward for the automatic leveling control system. The leveling strategy of “only go up” and a lower leg heightening can be used to effectively solve the “virtual leg” in the process of leveling. The automatic leveling data collected under no-load and full load was analyzed. It is concluded that the proposed leveling strategy can be used to quickly and smoothly level the vehicle body，and the automatic leveling control system has strong anti-interference ability，short leveling time，high stability，high reliability for use in military equipment，and can promote the intelligence level of weapons and equipment.

Key words: ammunitionsupplyvehicle, automaticlevelingcontrolsystem, vehicle-borneplatform, double-axistiltanglesensor