Abstract: In order to provide the function of partial coherence analysis to the signal processor, the basic principles of the partial and multiple coherence analysis and their utilizations on vibration source identification are discussed in detail. The software developed for the 7T17S signal processor can be used not only for analyzing the partial and multiple coherence of signals,but also provide the functions of correlation, power spectrum and frequency respones analysis. It has been applied in i-dentifing the vibration source of the floor board of an electrical measuring vehicle. The main factors were determined and the positive result was obtained. This method can also be used for making the identifications of noise and other sources.