Abstract: Based on wavelet analysis theory, the distributed load to be identified was transformed into orthogonal wavelet basis domain, with a structural wavelet basis function. The linear relationship between the wavelet coefficients and structural measuring points response information was derived through the modal theory. And the wavelet coefficients were calculated, the plate structure subjected to distributed load was reduced with wavelet reconstruction method. The load identification theory proposed in the paper is applicable to all types of loads. The computation simulations show the universality of the theory and the excellent identification accuracy. Joined random noise, the simulation process shows that the method presented is not sensitive to the measured-data-noise, exhibiting well signal-to-noise in load identification.