Abstract: In view of the disconnection fault occurring at the adhesive joint of the reinforced beam in the static test of a spacecraft cabin structure, a fault tree was established by analyzing the design and process status of the test piece. The main causes of the fault were then identified by a qualitative analysis method to obtain the minimum cut set of the fault tree and troubleshoot the development process. In addition, the corresponding improvement measures were proposed. The ground test and in-orbit flight verification proved that the fault location was accurate and the improvement measures were effective, which verified the reliability of the structural system. The proposed analysis methods and measures may provide a reference for the structural design and technological improvement of beam adhesive joint for spacecraft.