针对环行防喷器的结构特征，提出了用声发射检测的平面定位方案。介绍了检测前的准备工作。对比了两次加载实验中的采集数据。结合凯塞尔效应的原理，分析了检测中的噪声来源，指出从保压阶段的采集数据中提取有效信号，并根据有效信号判断缺陷的性质，给出了检测结果，提出了目前在防喷器检测中急需解决的问题和工作方向。

A scheme of planar location of AE testing was proposed to the structural characteristics of an annular blowout preventer. The preparation work before testing was described. With using twice loading, contrasting the data collected in the two tests, combining the principle of Kaiser effect, and comprehensively analyzing noise sources in the tests, it was assured that the effective signals should be picked up from the data acquired at the pressure holding stage, and the nature of defect should be determined on the basis of them. Finally, it presented the results of test and put forward the problems which urgently needed to be solved in present and the direction of work.