The invention provides a message transmission system, method, and device. According to a frequency of sending a message unit to a sending queue of a source process unit from a thread unit of the source process unit in a first historical time period, a scale of a process encapsulation packet corresponding to a first current time period of the source process unit is determined; and according to thescale of the process encapsulation packet corresponding to the first current time period, the message unit in the sending queue of the source process unit is encapsulated, and a process encapsulationpacket is generated and sent to achieve message transmission. In this way, the utilization of network resources is increased and the transmission efficiency is improved.