Synchronous method, system, server and client for dynamic content distribution

The invention discloses a synchronous method, a system, a server and a client for dynamic content distribution. The method comprises the following steps of: selecting a channel for subscription/un-subscription from a channel list provided by a DCD (Data Carrier Detect) server and sending the information of the channel for subscription/un-subscription to the DCD server by a client; receiving the information of the channel for subscription/un-subscription and returning an operation result to the client by the DCD server; and simultaneously updating the channel list to be synchronous to the client. In the invention, the traditional PULL mode of the channel for subscription/un-subscription is changed into a PUSH mode, the client is convenient to subscribe/unsubscribe a new channel and simplify a subscription process, the experience that the client uses the dynamic content distribution is greatly improved, and the availability of the client for the dynamic content distribution is improved at the same time.