A network transmission control method, wherein the method is applied to a network transmission control system, the network transmission control system comprises a source node device, a first node device, and a second node device, and the method comprises: receiving, by the first node device, a first packet from the source node device, wherein the first packet carries Internet Protocol operation, administration and maintenance, IP OAM, information, and the IP OAM information comprises an IP OAM command; generating, by the first node device, a second packet based on the first packet, wherein the second packet carries the IP OAM information of the first packet and operation, administration and maintenance, OAM, information of the first node device, the OAM information of the first node device comprises an OAM command of the first node device, and the OAM command of the first node device is the same as the IP OAM command; and sending, by the first node device, the second packet to the second node device, wherein the second node device is a next-hop node device of the first node device; characterized in that before the sending, by the first node device, the second packet to the second node device, the method further comprises: receiving, by the first node device, a notification message from the second node device, wherein the notification message is used to indicate a forwarding type used by the second node device; and determining, by the first node device, that the forwarding type used by the second node device is different from a forwarding type of the first node device, and generating OAM information of the second node device, wherein the OAM information of the second node device comprises an OAM command of the second node device, wherein the second packet further comprises the OAM information of the second node device, and the OAM command of the second node device is the same as the IP OAM command. receiving, by the first node device, a first packet from the source node device, wherein the first packet carries Internet Protocol operation, administration and maintenance, IP OAM, information, and the IP OAM information comprises an IP OAM command; generating, by the first node device, a second packet based on the first packet, wherein the second packet carries the IP OAM information of the first packet and operation, administration and maintenance, OAM, information of the first node device, the OAM information of the first node device comprises an OAM command of the first node device, and the OAM command of the first node device is the same as the IP OAM command; and sending, by the first node device, the second packet to the second node device, wherein the second node device is a next-hop node device of the first node device; characterized in that before the sending, by the first node device, the second packet to the second node device, the method further comprises: receiving, by the first node device, a notification message from the second node device, wherein the notification message is used to indicate a forwarding type used by the second node device; and determining, by the first node device, that the forwarding type used by the second node device is different from a forwarding type of the first node device, and generating OAM information of the second node device, wherein the OAM information of the second node device comprises an OAM command of the second node device, wherein the second packet further comprises the OAM information of the second node device, and the OAM command of the second node device is the same as the IP OAM command. receiving, by the first node device, a notification message from the second node device, wherein the notification message is used to indicate a forwarding type used by the second node device; and determining, by the first node device, that the forwarding type used by the second node device is different from a forwarding type of the first node device, and generating OAM information of the second node device, wherein the OAM information of the second node device comprises an OAM command of the second node device, wherein the second packet further comprises the OAM information of the second node device, and the OAM command of the second node device is the same as the IP OAM command.