Abstract: A one-to-many transmission method and system to transmit real-time video and audio data on wireless local area network, which includes a first station, a second station, and at least one third station. The first station provides at least one video and audio program and a set-packet, and periodically transmits them to the second station. The second station transmits a command-packet to the first station to determine the content of video and audio program transmitted by the first station, and receives the set-packet to confirm whether the set-packet is correct or not. The third station intercepts and receives the set-packet, and according to the configuration of the set-packet changes its network configuration to receive the video and audio program transmitted by the first station, and selectively play the content.