The embodiment of the invention provides an active-cache-based data transmission method and system used in a named data network. The method is applied to a terminal and includes the steps that when the terminal starts to move, a first intensity-time series and a first rate-time series are acquired; according to the first intensity-time series, the switching start time when the terminal is disconnected from a first node is determined; according to the switching start time and the first rate-time series, to-be-cached content which is already requested by the terminal but can not be received before node switching starts is determined; a first interest packet identifying the to-be-cached content is sent to the first node so that the first node can receive the first interest packet and cache the to-be-cached content into a node subset corresponding to the first node; after the terminal is switched to be connected to a second node, a second interest packet used for requesting the to-be-cached content is sent to the second node; the to-be-cached content which is acquired by the second node from the node subset corresponding to the first node according to the second interest packet and sent is received.