In order to improve the support capability and service level of weather forecast service, the weather forecast television discussion system based on the preset scene and double stream real time back up is established. It realizes the preset operation mode according to the conference content by the central control system. The operation procedures, such as audio video matrix switch and camera adjustment, are simplified. The downlink/uplink audio and video signals are backed up in real time. If the main equipment in run abruptly breaks off, the back up equipment will be put into use at once. The digital processor is used to deal with audio signals to improve the sound effect and reduce the noises induced from improper manual adjustment. This system is suitable for both standard and high definition systems after adjusting some correlation parameters. The structure and principles of the system are introduced, which supplies references for the maintenance, operation, and construction of the like weather forecast television discussion systems.