MIL-STD-1553B bus has a wide application in airborne avionics systems, the bus monitoring systems can realize the real-time bus information monitoring. A study method for bus monitoring systems based on dynamic interface control document (ICD) is proposed, a model of bus monitoring systems and tools of cus? tomizing ICD database are established. The method of post-hoc analysis based on bus information monitoring is studied. The different embedded-system only needs to redefine the ICD to realize the bus monitoring, which can improve the expansibility and maintenance of systems.