A method for transmitting a physical layer operations administration and maintenance (PLOAM) message, said method comprising: splicing multiple messages into a message group by a predetermined manner, wherein a sum of a length of content of the multiple messages is less than a predetermined length; or, splicing multiple message fragments into a message group by another predetermined manner, wherein the multiple message fragments are obtained by dividing a message, and a length of content of the message is greater than the predetermined length; and transmitting the message group in one Gigabit Passive Optical Network Transmission Convergence, GTC, frame; wherein the predetermined manner is one of following three manners: sequentially setting PLOAM related contents of each of the messages in the message group, wherein the PLOAM related contents comprise: a destination address, a message type, the message contents and a check code; sequentially setting PLOAM related contents of each of the messages in the message group, wherein the PLOAM related contents comprise: a destination address, a message type and the message contents; and setting a common check code of the multiple messages; setting a PLOAM related common destination address and a PLOAM related common check code of the multiple messages in the message group, and sequentially setting PLOAM related contents for each of the messages; wherein the PLOAM related contents comprise: a message type and the message contents; said another predetermined manner is: loading each of the message fragments in message contents of the format of a PLOAM message, wherein the format of the PLOAM message sequentially carries the following information: a destination address, a message type, message contents, and a check code; and sequentially arranging multiple formats of the PLOAM messages one by one to form the message group. splicing multiple messages into a message group by a predetermined manner, wherein a sum of a length of content of the multiple messages is less than a predetermined length; or, splicing multiple message fragments into a message group by another predetermined manner, wherein the multiple message fragments are obtained by dividing a message, and a length of content of the message is greater than the predetermined length; and transmitting the message group in one Gigabit Passive Optical Network Transmission Convergence, GTC, frame; wherein the predetermined manner is one of following three manners: sequentially setting PLOAM related contents of each of the messages in the message group, wherein the PLOAM related contents comprise: a destination address, a message type, the message contents and a check code; sequentially setting PLOAM related contents of each of the messages in the message group, wherein the PLOAM related contents comprise: a destination address, a message type and the message contents; and setting a common check code of the multiple messages; setting a PLOAM related common destination address and a PLOAM related common check code of the multiple messages in the message group, and sequentially setting PLOAM related contents for each of the messages; wherein the PLOAM related contents comprise: a message type and the message contents; sequentially setting PLOAM related contents of each of the messages in the message group, wherein the PLOAM related contents comprise: a destination address, a message type, the message contents and a check code; sequentially setting PLOAM related contents of each of the messages in the message group, wherein the PLOAM related contents comprise: a destination address, a message type and the message contents; and setting a common check code of the multiple messages; setting a PLOAM related common destination address and a PLOAM related common check code of the multiple messages in the message group, and sequentially setting PLOAM related contents for each of the messages; wherein the PLOAM related contents comprise: a message type and the message contents; said another predetermined manner is: loading each of the message fragments in message contents of the format of a PLOAM message, wherein the format of the PLOAM message sequentially carries the following information: a destination address, a message type, message contents, and a check code; and sequentially arranging multiple formats of the PLOAM messages one by one to form the message group. loading each of the message fragments in message contents of the format of a PLOAM message, wherein the format of the PLOAM message sequentially carries the following information: a destination address, a message type, message contents, and a check code; and sequentially arranging multiple formats of the PLOAM messages one by one to form the message group.