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For solving level alarm of high pressure vessels or corrosive liquid vessels, a new non-contact level alarm device was designed by using ultrasonic wave. The attenuation characteristics of ultrasonic echo wave remained in the wall of vessels is analyzed when the medium in vessels is liquid or gas. A new method for measuring fixed-point liquid level was proposed by using this principle, and the system of level alarm was proposed. In this way, the transducer is only needed to touch to the outside surface of the wall of vessels. The device is very suitable for measuring fixed-point liquid level of high pressure vessels or corrosive liquid vessels, and has the merits of high sensitivity and reliability.