In the process of concrete construction, it is an important guarantee for ensuring the quality of the concrete pouring and vibrating effect to get the vibrating rod and the precise positioning of the effective state determination. It’s obvious for people to distinguish two kinds of noise when the vibrating rod is in the concrete (load) or not in the concrete (noload). A new approach of effective judgment on the vibrator working state is developed by timefrequency conversion, the analysis of frequency spectrum and the analysis of encircled energy.