Abstract: Acoustic emission test was done during tension on zirconium metal, acoustic emission signals’ parameters and frequency characters were analysed. The results indicated that the channel hits and so on parameters had good ability to characterize damage status of different phases of tension, the scope of signal frequencies was from 0 to 500 thousands heltz, and the central frequency was about 130 thousands heltz. The conclusions were very valuable to detect and monitor pressure vessels made of zirconium by accostic emission technology.