The invention discloses a downlink discontinuous transmission (DTX) state control method, which comprises the following steps of: after a network side finishes channel distribution for a call and when the DTX function is permitted to use and a called side does not answer, controlling the DTX state of a calling side in a closed state; and after the called side answers, controlling the DTX state ofthe calling side in a started state. The invention also discloses a corresponding base station, a code type exchanger and a wireless communication system. By adopting the method, when the system is permitted to use the DTX function, the DTX state can be correspondingly controlled according to the current state of the call; at a ringing stage, the DTX state of the calling side is controlled in theclosed state to meet that the ring tones can be completely transmitted to a calling user at the ringing stage; and at a call stage, the DTX state of the calling side is controlled in the started state to reduce interference in the network and resource waste.