系统分析了吉林省丰满地震观测井的水氡异常及其与远近地震的对应关系，发现在日本海等地的４０次中强以上地震之前有很好的对应关系。因此，笔者认为丰满井是一口映震灵敏井，并对映震灵敏的条件作了初步讨论 This paper systematically analyzes the water radon anomalies and their correspondences with the near and far earthquakes in the Manjing seismic observation well in Jilin Province and finds that there are good correspondences before the 40 moderate-strong earthquakes in the Japan Sea and other places. Therefore, I believe that the plump well is a reflection-sensitive well and a preliminary discussion of the conditions sensitive to earthquakes