A packet synchronization procedure of a network of intelligent substation process layers, the method comprising: recording a transmission delay in a network transmission device in a sampled value packet, SV, sent by a fusion unit; implement, by an SV data reception device, a packet synchronization according to the transmission delay in the network transmission device registered in the SV packet, in which the transmission delay recording in a transmission device of network in an SV packet sent by a merger unit is characterized by: reserving a time domain field in the SV packet according to a configuration, in which the configuration is based on a combination of at least two of a control address Media access, MAC, a destination MAC address, a packet type, an Internet protocol address, IP, a destination IP address, a source port number and a destination port number, when the unit Merge sends the SV packet; the time domain field being used to make statistics, on the part of the network transmission device, on the transmission delay and accumulate the transmission delay of all levels of network transmission devices for storage in the domain field of time; record the transmission delay of the SV packet in the network transmission device in the time domain field of the SV packet by adopting a way of adding timestamps for the SV packet at input and output ports of all device levels of network transmission; and accumulate the transmission delay of all levels of network transmission devices in the time domain field when the SV packet is forwarded by all levels of network transmission devices.
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