Abstract: A method for transmitting a three-dimensional (3D) picture in an MMS message is disclosed. The method includes: in a Synchronized Multimedia Integration Language (SMIL) file, a sender assigns a same Identifier (ID) for two different pictures, sets an attribute of each of the two pictures as a 3D display picture, and sends the two pictures to a receiver; or, a sender synthesizes two different pictures in the SMIL file into a file, assigns an ID for the synthesized file, sets an attribute of the ID as a 3D display picture, and sends the synthesized file to a receiver; and the receiver displays the two pictures in a 3D mode. A system for transmitting a 3D picture in an MMS message is also disclosed. With the technical solution of the disclosure, the problem that transmission of a 3D picture cannot be supported in an existing protocol can be solved.