Method and system for communication of distributed system

The invention discloses a method for communication of a distributed system, comprising the following steps: determining priority order of massage by an originating process unit and storing the priority order in a temporary buffer and a massage module; determining whether to process the massage by a target process unit according to synchronous serial number of the received massage sent by the massage module, and returning a response massage according to the processing result and storing in the massage module; and updating the temporary buffer by the originating process unit according to the response massge received from the massage module. The invention also discloses a system for communication of a distributed system. By adopting the method and the system in the invention, massage transmission order can be optimized, repeated massageis avoided, and the distributed system communication traffic is reduced, thus improving the communication reliability of the distributed system.