The present disclosure provides a method for transmitting a small data packet, wherein Machine-Type Communications User Equipment (MTC UE) carries a small data packet needed to be sent to a media gateway in a network during a process of creating a bearer, and the media gateway sends the received small data packet to a MTC server. The present disclosure further discloses a system for transmitting a small data packet. According to the Machine to machine (M2M) application requirement, network optimization is performed for the case that a small data packet is sent in a M2M offline state, thereby storing the allocation of radio resources and core network media resources, reducing the mobility management and signaling interaction in the offline state, improving the utilization ratio of network resources.