The invention discloses a method for transferring audio and video data streams based on a TCP mode of a DSS time sharing system. The method comprises the following steps: step 1, designing a TCP transfer plug-in based on a DSS framework; step 2, designing a TCP reflection module plug-in based on the DSS framework; step 3, when a user proposes a request to the TCP transfer plug-in in a user terminal namely a RTSP client, performing stream guide on an audio and video source according to a data storage file by the TCP transfer plug-in, transferring the audio and video source to a server, and when the server captures audio and video data streams, triggering the TCP reflection module plug-in, wherein the data storage file is from a database; and step 4, when the server captures the audio and video data streams, reflecting the audio and video data streams in the database corresponding to the user request by the TCP reflection module plug-in to transfer the audio and video data streams. By adoption of the problem provided by the invention, the NAT problem is avoided, the stability of transferring the audio and video data streams is improved, the resource occupation of the server is reduced, and the transmission of the audio and video data streams is smoother.