For a certain type of heavy load aerial work platform, in the design process of the telescopic boom system, in addition to ensuring that the strength meets the requirements, it is also necessary to ensure good rigidity. This is to provide a better working experience for the operators and enable them to carry more materials. Different models were established for the boom system: one was a model based on shell elements with contact non-linearity considered as the main body, and the others was simplified beam element model. The results were compared and analyzed under typical working conditions to determine a more optimal modeling method, in order to find an efficient computational analysis model for calculating the variation law of end displacement.