A terminal Trigger message valid time control method and system

The present invention discloses a terminal trigger message valid time control method, comprising: receiving a mobile terminal management unit (MTC) from the application server type communication machine trigger message; scenario of congestion control, mobility management unit determines the backoff timer terminal time value is greater than the trigger time value of the timer message is valid, for the trigger message the terminal reconfiguration time effective timer value. Accordingly, the present invention also discloses a terminal trigger message valid time control system. The present invention enables a network before the terminal backoff timer expires, the terminal can retain the trigger message in order to avoid triggering the terminal failure, thereby improving the success rate of the terminal is triggered.