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Experimental observations show that the random process of two phase flow behind an aerator is an ergodic process and its amplitude distribution is similar to a normal distribution. The maximum pressure fluctuation is at there attachment point where the jet trajectory flow over the aerator re attaches to bottom of the channel, and its amplitude is 2–3 times Iarger than when there is no aerator. There is a dominant frequency of 1.24 Hz in the model, but the coherence in the frequency domain is not obvious for other frequencies beside the dominant frequency. There is a large vortex at there attachment point behind the aerator but comelation among the measurement points is not obvious in the time domain.