| As a new surface peening method, high pressure waterjet peening (WJP) was used to improve the fatigue life of treated components by changing the surface . Although there was just 4-5 years to this day , because of the better effects and lower cost and easier to carry out robotization and cutting/peening/ forming as a kind of multiplicity treatments , some researches had been started overseas . At the region of air ,for developing the fatigue strength and the using life of components , shot peening had been used for some important components , such as air engine vane, undercarriage and aerofoil wainscot. So if WJP can take place of the shot peening ulteriorly , it will be develop the fatigue life and the whole properties of engine and plane .At present, the research of the WJP hasn't been started in china , so it need to start for the potential predominance of the technology for there were the mature equipments .In this paper, the submerged waterjet was adopted to strengthen the specimen surface of 7075T651 and TC4 . And that the rule and effect of WJP's parameters influences the surface properties of test alloy were researched . The results demonstrated that there were important inferences by the three parameters such as time , distance and pressure for the ability of cavitation ,and there was a flat in a certain extent. Compared with the non-peening and shot peening, the fatigue life of the WJP specimens was improved by 22% ,6.6% and 8.2%,2%, respectively . The compressive stress of residual layer introduced by WJP was higher than that introduced by shot peening, so the fatigue life of the specimens treated by WJP increased much more . Because of the surface profile was protected by WJP , the good surface quality also insured the high fatigue life .
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