The invention discloses a method for shutting off a downlink service time slot in a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system, comprising the following steps of: receiving a downlink base band signal sent by a base band unit (BBU); detecting whether the downlink base band signal sends data on each antenna or not in the downlink service time slot according to the time slot configuration information of a wireless frame; and shutting off a transmission path corresponding to the antenna in the downlink service time slot for the antenna which does not send data in the downlink service time slot according to the detection result. In the method, the path is only opened to the antenna which sends service data; for the antenna which does not send the service data, the path corresponding to the antenna is shut off; the antennae are mutually independent so as to avoid consuming energy; and energy saving effect is improved.