A method, a terminal, and a system structure for transmitting and receiving services, which relate to the field of communication technology, so as to realize coordinated operation between Adaptive Code and Modulation and Hitless Switch Mode functions in a microwave communication system, thus improving system transmission efficiency and transmission reliability. The method for transmitting services includes the following steps. A transmitting end of an active link receives an ACM switching indication fed back by a receiving end of the active link, and a transmitting end of a standby link receives an ACM switching indication fed back by a receiving end of the standby link; the transmitting end of the active link performs ACM switching on the services transmitted through the active link and transmits the services; and the transmitting end of the standby link performs ACM switching on the services transmitted through the standby link and transmits the services.