The pipeline transportation has become the important means.The more of the pipe and the longer of pipe life span,construetion blemish,corrosion perforation,abruty nature disaster and sabotage,all the above factors may result in pipeline leakage.To ensure the safety of pipeline and minimize the losses caused by leakage accidents,it is significant to study leakage–detecting technology of higher reliability and veraeity.The technology of detection leak on the pipelines can discover pipeline leakage acc...