The present invention provides a method and system for sharing an antenna between multiple operators and a radio frequency and digital conversion unit, where the system includes the radio frequency and digital conversion unit and an active antenna; the radio frequency and digital conversion unit is configured to convert a radio frequency signal of each radio frequency module into a digital signal, and send digital signals of a same sector to an active antenna corresponding to the sector; and the active antenna is configured to perform at least one of vertical beam forming processing and horizontal beam forming processing on received digital signals according to a signal transmitting parameter that is set for each operator, convert the processed digital signals into radio frequency signals, and then transmit the radio frequency signals from an air interface. The present invention facilitates different network planning and network optimization performed by each operator on a precondition that multiple operators share an antenna.
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