The No.1 bronze sacred tree discovered at the No.2 pit of Sanxingdui site is large in size and complex in structure. Due to its various diseases, such as corrosion and cracks, the structural stability of the tree has always been the focus during its exhibition. In order to fully record and evaluate the preservation conditions of the tree and understand the stresses placed upon it, our study, based on the original geometric form and internal structure, applied the 3D digital modeling technology to establish geometric and numerical models of the bronze tree. This technology also helped to estimate some immeasurable data, such as the mass distribution and position of the mass center of the tree. In addition, the safety of the still bronze tree was analyzed in terms of stress and displacement using the finite element method. According to the results of the finite element method and simplified calculation of mechanics of materials, the connecting joints between the dragon body and the trunk, and the ends of branches are under high stress and vulnerable to damages. This study could provide scientific references for the installment of consolidation joints and other measures for the display of the No.1 bronze sacred tree.