Abstract: The damage location method based on natural frequency was deduced seriously, which showed that the damage location parameter was only related to the damage location. Based on damage location, the method of determination of damage degree was deduced. By finite element analysis on automotive steel cantilever specimens by use of ABAQUS, change patterns of the combination of damage location parameters and the parameter of determining damage degree could be obtained. Afterwords, the effect of the damage degree on result of damage location was discussed, and it was found that when notch length was less than 50% of the width of specimen element, this method not only could be used for high-precision locating, but also can be used for the determining of damage degree. Finally, modal experiment was conducted by use of dynamic test and analysis system, which verified the validity and accuracy of this method.