A method for sending a discovery signal on an unlicensed carrier, comprising: configuring a parameter of a discovery signal sent on an unlicensed carrier by an access point; and sending, by the access point, the discovery signal on the unlicensed carrier; wherein the step of sending, by the access point, the discovery signal on the unlicensed carrier comprises: before the access point preempts the unlicensed carrier, sending the discovery signal on the unlicensed carrier compulsively; or, after the access point preempts the unlicensed carrier, sending the discovery signal on the preempted unlicensed carrier; wherein, the step of sending, by the access point, the discovery signal on the unlicensed carrier is further conditioned on when the access point determines that one or more of the following conditions are satisfied, sending the discovery signal on the unlicensed carrier: a sending period of the discovery signal is greater than a preset period threshold; a power of the discovery signal is smaller than a preset power threshold; an occupied bandwidth of the discovery signal is smaller than a preset bandwidth threshold; a duration of the discovery signal is smaller than a preset time threshold; and a number of ports of the discovery signal is smaller than a preset number threshold. configuring a parameter of a discovery signal sent on an unlicensed carrier by an access point; and sending, by the access point, the discovery signal on the unlicensed carrier; wherein the step of sending, by the access point, the discovery signal on the unlicensed carrier comprises: before the access point preempts the unlicensed carrier, sending the discovery signal on the unlicensed carrier compulsively; or, after the access point preempts the unlicensed carrier, sending the discovery signal on the preempted unlicensed carrier; wherein, the step of sending, by the access point, the discovery signal on the unlicensed carrier is further conditioned on when the access point determines that one or more of the following conditions are satisfied, sending the discovery signal on the unlicensed carrier: a sending period of the discovery signal is greater than a preset period threshold; a power of the discovery signal is smaller than a preset power threshold; an occupied bandwidth of the discovery signal is smaller than a preset bandwidth threshold; a duration of the discovery signal is smaller than a preset time threshold; and a number of ports of the discovery signal is smaller than a preset number threshold. before the access point preempts the unlicensed carrier, sending the discovery signal on the unlicensed carrier compulsively; or, after the access point preempts the unlicensed carrier, sending the discovery signal on the preempted unlicensed carrier; wherein, the step of sending, by the access point, the discovery signal on the unlicensed carrier is further conditioned on when the access point determines that one or more of the following conditions are satisfied, sending the discovery signal on the unlicensed carrier: a sending period of the discovery signal is greater than a preset period threshold; a power of the discovery signal is smaller than a preset power threshold; an occupied bandwidth of the discovery signal is smaller than a preset bandwidth threshold; a duration of the discovery signal is smaller than a preset time threshold; and a number of ports of the discovery signal is smaller than a preset number threshold. a sending period of the discovery signal is greater than a preset period threshold; a power of the discovery signal is smaller than a preset power threshold; an occupied bandwidth of the discovery signal is smaller than a preset bandwidth threshold; a duration of the discovery signal is smaller than a preset time threshold; and a number of ports of the discovery signal is smaller than a preset number threshold.