In order to verify the applicability of the damage identification method based on curvature mode theory and wavelet transform,the finite element model of a steel truss bridge was created by using the SAP2000 software.By adjusting the elastic modulus of the nodes,the nodes' connection stiffness was modified to simulate different damage conditions of the nodes,then according to the vibration mode shapes,the curvature modes of the structure were calculated.By using the Bior3.9 wavelet function programming in the Matlab software,the D value of damage index was extracted from the wavelet transform coefficients.The results show that the method can identify the location of damage nodes,and the damage index will increase with the degree of damage,which provides a reference to the damage detection and health monitoring of steel truss bridges.