Abstract: The erosion process of LF3 aluminium alloy was monitored by the acoustic emission technology, and the characteristic of the erosion acoustic emission signals of the Alloy was researched to prove the feasibility of using the acoustic emission technology to detect the erosion destruction condition of the aluminium alloy vessels. The research would extend the application scope of the acoustic emission technology. The stimulated experiment of erosion experiment of aluminium alloy was made according to the erosion principle and characteristic of the the aluminium alloy vessels in use. The erosion acoustic emission signals are obtained. The characteristic of these signals is researched, and the analysis of the distribution and relevancy of the character parameters is made. The electrochemistry experiment is made to prove the rationality of the experiment. The conclusions of this article can be used as the basis of the local fault diagnosis.