Abstract: Fiber Reinforced Plastics are widely used in petrochemical industry because of their premium properties such as corrosion resistant,easily shaping and so on.But there is a lack of effective methods in detection and life evaluation of FRP products in service,due to their various failure forms detections.This paper is going to discuss the effectiveness and applicability of Acoustic Emission Detection Technology used in FRP tests,through the attenuation test of FRP,the analysis of reality cases and the comparison in attenuation of FRP and metallic materials.The result shows that acoustic emission detection technology could apply to practice,and the failure mode can also be predicted according to an acoustic attenuation test.