Vibration characterization of power transformer is an import key to reliability and trouble shooting, The vector fitting (VF)method is used to analysis vibration test data of power transformer surface. The VF is compared with PolyLSCF method and the experimental data of power transformer is analyzed. It can be found that the 100 Hz operation frequency causes harmonic response, and the vibration level of the transformer bottom is much higher and local mode is checked after sole analysis. The analysis result will provide advice on optimization of measurement point locations and failure recognition.