Smart substation is the important base and support for the construction of smart grid. With the development of communication technology

the scheme of shared-network in the design of smart substation communication network has recently been studied. This scheme not only improves the efficiency of the network

but also brings about challenges for the real-time and reliability of communication. To cure the above problems

the cause and the influence on message transmission of congestion situation in the scheme of shared-network are analyzed firstly. Then

a comprehensive communication service strategy based on message information label is put forward. The information of message information label and flow amount monitoring are used to identify and filter massages. The identification services for all kinds of message are realized by the communication scheduling method based on the custom length weighted round robin based least lag queue(CLWRR-LLQ). The simulation results shows that the scheduling strategy can identify and discard the camouflaged false message with big flow amount

avoid the timeout and loss in transmission of important messages caused by network congestion

and reduce the transmission time of other messages.