Green function method was extended to deal with the load identification of free structures with overall translation. The kernel function was obtained by the superposition of impulse response of overall translation and elastic vibration without taking into account rigidflexible coupling effect, the convolution integral relationship of absolute motion acceleration at measuring point and dynamic loads was constructed, and the regularization algorithm of truncated singular value decomposition (TSVD) was applied to solve the corresponding deconvolution equations. The proposed method was used to analyze a beam and a composite thinwalled structure in the motion of overall translation. The numerical simulation data was superimposed with random noise of 20% noise level and taken as the input of inverse problem to identify the given dynamic load. It is shown that Green function approach described in the paper can be effectively used to identify the dynamic loads acting on complex structures of overall translation, and regularization algorithms can solve this type of inverse problems with high robustness and noise resistance.