Provided are a method, system, device for controlling congestion or overload and an eNB. The method includes: one or more eNBs configured to detect congestion or overload of user plane data are selected, and the one or more eNBs selected are notified; the one or more eNBs selected detect a congestion or overload event of the user plane data; when a triggering condition is met, the one or more eNBs selected send congestion or overload indication information to a GCS AS; and the GCS AS determines a start or end of congestion or overload which occurs in an MBMS area according to the congestion or overload indication information, and correspondingly selects a manner in which trunking service data are sent. By the technical solutions of the disclosure, the problem of influence for a trunking service when congestion or overload occurs in a network may be solved.