Abstract: Disclosed are a method for establishing a direct connection link, and a method and a node for same realizing data transmission thereby. The establishment method comprises: establishing a direct connection link between a first node and a second node, determining a policy according to pre-set direct connection control information, and determining direct connection control information corresponding to the established direct connection link. The method disclosed herein realizes, by determining, for a direct connection link, specialized direct connection control information for identifying the direct connection link, optimization of the establishment and transmission process of the direct connection link, such that the direct connection link well distinguishes from a link of a basic network architecture, thus improving the network efficiency.