A method for measuring a network delay, comprising: acquiring by a data collecting point, DCP, delay measurement information obtained by measuring a service flow by at least one target logical port, TLP, wherein the delay measurement information comprises: timestamp information, a service flow identifier, and a TLP identifier, and wherein the TLP corresponds to an upstream transmit-end ingress of a network or a downstream receive-end egress of a network; and transmitting, by the DCP, the delay measurement information to a measurement control point, MCP; wherein the acquiring delay measurement information obtained by measuring a service flow by at least one TLP comprises: acquiring, by a DCP managing an upstream TLP, transmit-end delay measurement information obtained by measuring a transmitted service flow by at least one upstream TLP, wherein, the transmit-end delay measurement information is corresponding to a delay measurement flag which is added to a data packet of the service flow by the at least one upstream TLP, and wherein, within each measurement period one data packet is added with the delay measurement flag; and acquiring, by a DCP managing a downstream TLP, receive-end delay measurement information obtained by measuring a received service flow by at least one downstream TLP, wherein, the receive-end delay measurement information is corresponding to the delay measurement flag which is added to the data packet by the at least one upstream TLP; and the step of transmitting the delay measurement information to an MCP comprises: transmitting, by the DCP managing the upstream TLP, the transmit-end delay measurement information to the MCP, wherein the transmit-end delay measurement information comprises: transmit-end timestamp information, a service flow identifier, and a TLP identifier; and transmitting, by the DCP managing the downstream TLP, the receive-end delay measurement information to the MCP, wherein the receive-end delay measurement information comprises: receive-end timestamp information, a service flow identifier, and a TLP identifier. acquiring by a data collecting point, DCP, delay measurement information obtained by measuring a service flow by at least one target logical port, TLP, wherein the delay measurement information comprises: timestamp information, a service flow identifier, and a TLP identifier, and wherein the TLP corresponds to an upstream transmit-end ingress of a network or a downstream receive-end egress of a network; and transmitting, by the DCP, the delay measurement information to a measurement control point, MCP; wherein the acquiring delay measurement information obtained by measuring a service flow by at least one TLP comprises: acquiring, by a DCP managing an upstream TLP, transmit-end delay measurement information obtained by measuring a transmitted service flow by at least one upstream TLP, wherein, the transmit-end delay measurement information is corresponding to a delay measurement flag which is added to a data packet of the service flow by the at least one upstream TLP, and wherein, within each measurement period one data packet is added with the delay measurement flag; and acquiring, by a DCP managing a downstream TLP, receive-end delay measurement information obtained by measuring a received service flow by at least one downstream TLP, wherein, the receive-end delay measurement information is corresponding to the delay measurement flag which is added to the data packet by the at least one upstream TLP; and acquiring, by a DCP managing an upstream TLP, transmit-end delay measurement information obtained by measuring a transmitted service flow by at least one upstream TLP, wherein, the transmit-end delay measurement information is corresponding to a delay measurement flag which is added to a data packet of the service flow by the at least one upstream TLP, and wherein, within each measurement period one data packet is added with the delay measurement flag; and acquiring, by a DCP managing a downstream TLP, receive-end delay measurement information obtained by measuring a received service flow by at least one downstream TLP, wherein, the receive-end delay measurement information is corresponding to the delay measurement flag which is added to the data packet by the at least one upstream TLP; and the step of transmitting the delay measurement information to an MCP comprises: transmitting, by the DCP managing the upstream TLP, the transmit-end delay measurement information to the MCP, wherein the transmit-end delay measurement information comprises: transmit-end timestamp information, a service flow identifier, and a TLP identifier; and transmitting, by the DCP managing the downstream TLP, the receive-end delay measurement information to the MCP, wherein the receive-end delay measurement information comprises: receive-end timestamp information, a service flow identifier, and a TLP identifier.