An attachment transferring method, apparatus, and system, is described. Technical solutions are described that save traffic in a mobile client during transfer of an attachment of a network message, and improve transferring efficiency. The method may include parsing a first attachment message from a first mobile client, and sending an attachment obtained through parsing to a file server. The method may include sending a request for extracting the attachment to the file server according to a request message from a second mobile client for extracting the attachment. The method may include sending the attachment to the second mobile client.