Abstract: A data transmission method is applied to a decoding end of a network audio and video matrix system, and the decoding end is in communication connection with an encoding end and several secondary decoding ends. The data transmission method comprises: acquiring request data signaling from a secondary decoding end, wherein the request data signaling comprises a distribution data signaling receiving address of the secondary decoding end; determining whether a currently occupied distribution capability value reaches a maximum distribution capability value; and if yes, sending a secondary distribution device table to the secondary decoding end, such that the secondary decoding end sends the request data signaling to other secondary decoding ends in the secondary distribution device table, and after the sending of the secondary distribution device table is completed, disconnecting a network connection with the secondary decoding end.