Palletizer is supporting the use of Fly ash brick machine, and it's widely used to palletizing after bricks suppressed and formed. But positioning accuracy is low, stacking quality is poor, security risks and other shortcomings occur in the process of stacking.In order to modify these shortcomings, improving the palletizer pneumatic position control system by using the load port independent control technology which can balance the vertical load, displacement closed-loop and pressure closed-loop control were used for two chambers of the cylinder, to effectively reduce the positioning errors, to improve the positioning accuracy and response speed of the palletizer,at the same time tomake the displacement control chamber at low pressure values.Independent load portscontrol technology can effectively improvethe productivity and energy utilization efficiency of the palletizer.