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The principle of holes leaking create ultrasonic and the relationship between the sound pressure and the pressure or hole size was discussed in this paper. A method of leak hole estimation by the relationship and a design of gas leak ultrasonic testing system were presented. Experimental results which obtained by the gas leak ultrasonic testing system indicated the method is stable, reliable and tallying with the actual results. The method can estimate the leak hole quickly and exactly. Compared with the method of fitting the Reynolds number and amount of leakage, the accuracy has improved to some extent, and it has certain significance in the fast detection of the leak hole size. It could be popularized in the gas leak ultrasonic testing system.