Provided are a method and device for sending message. The method includes that: a mapping table is established; a message is received from a receiver; the mapping table is searched to obtain a Route Identification (RID) of an Access Service Node (ASN) of a sender corresponding to the message according to the message; and the message is sent to the ASN according to the found RID of the ASN. By the technical solution, the problem of non-uniformity of access manners for uplink and downlink data streams in a related technology is solved, and a proper access manner can be selected for the downlink data stream.