Abstract: Aiming at the boom of the tower crane inevitably exiting resonance phenomenon because of frequent starting, braking and wind load, a complete dynamic model of the boom of the tower crane is setup by the finite element software ABAQUS. Through the modal analysis , it determined the impact of key modal frequency of statically determinate and indeterminate structure constraint. And according to the maximum lifting weight of the boom , a harmonic response analysis was carried out to get the displacement frequency curve. The result provides the scientific guidance for reasonable design and safe use of the boom.

Key words: the boom of tower crane, modal analysis, harmonic response analysis, resonance