Abstract: This paper presents a synthesized model updating method using the modal parameters and frequency response functions(FRF) extracted from the vibration test data. Based on an established preliminary dynamic model, this method first updates the analytical model by use of the measured modal parameters, and then updates the dynamic characteristics of the analytical model with the measured frequency response functions in order that the modal parameters and FRF acceleration obtained by the updated dynamic model agree well with those measured. The detailed mathematical theory and formulation of this method are presented in the paper. The validation and accuracy of this method is analyzed and discussed through a numerical example.