A method, an apparatus, and a system for transmitting data relate to the communications field, and can effectively improve a success rate of request interest packet reception by a content source or a router. The method includes: receiving a detection interest packet, generating a detection response data packet according to a content name, and adding a mobility status of a first network node (50) to a status record entry; sending the detection response data packet to a second network node (60), so that the second network node (60) adds a mobility status of the second network node (60) to a first status record entry and sends the detection response data packet to a client (70), and the client (70) determines a revised value of a first expected distance according to the first status record entry and the first expected distance, generates a request interest packet, and sends the request interest packet to at least one network node; and receiving the request interest packet sent by the second network node (60). The method, apparatus, and system for transmitting data are used for data transmission.