The invention provides a method and device for an IBM host to realize event-driven architecture. The method comprises the steps of obtaining EDA attention event content obtained when online transaction is carried out; calling an EDA event triggering program, sending the EDA attention event content to the EDA event triggering program, and reading an event triggering condition corresponding to the EDA attention event content and determining whether a corresponding EDA attention event is triggered or not through combination of the EDA attention event content, by the EDA event triggering program;storing the EDA attention event content and information of event subscribers to a postprocessing database if the EDA attention event is triggered; carrying out transcoding, format conversion and eventmessage packaging on the EDA attention event content in the postprocessing database through utilization of an EDA long hang process, thereby obtaining a legal EDA event message; and pushing the legalEDA event message to the event subscribers in a mode of calling an event management interface of an event issuer. According to the method, the existing technical problem that information sending between an IBM host and an open platform is low, host resources are wasted seriously, and curing is inflexible is mitigated.