The invention relates to a work procedure for a vehicle posture adjusting system. System control modes are divided into the manual control mode and the automatic control mode. In an automatic control state, a driver operates corresponding vehicle posture action buttons, and a system can acquire vehicle posture position signals according to program settings to achieve a state preset by a program; in a manual control state, the driver determines the duration of oil injection and drainage of hydro-pneumatic suspensions through the duration of control over the vehicle posture action buttons to achieve a vehicle posture height position control effect; the system conducts vehicle posture displacement control in the direction perpendicular to the ground through displacement sensors arranged in the hydro-pneumatic suspensions and conducts vehicle body load bearing plane levelness control through tilt angle sensors arranged at the gravity center position of a vehicle body, and an alarm can be given in time when a stroke exceeds the limit; and pressure sensors are additionally arranged to conduct axle load monitoring and pressure closed-loop control, and an alarm can be given in time when the pressure exceeds the limit.