A method for realizing device-to-device communication relay selection, comprising: sending , by a user equipment, relay-related information used for determining a relay node to a network control node; and when the user equipment is determined as a relay node, receiving , by the user equipment, device-to-device communication relay configuration information sent by the network control node; characterized in that : before the user equipment sends the relay-related information to the network control node, receiving, by the user equipment, a relay reception resource pool and relay threshold information sent or preconfigured by the network control node through broadcasting; judging, by the user equipment, whether a relay threshold is satisfied according to a measurement result of measurement performed to the serving cell, and sending the relay-related information to the network control node only when the threshold is satisfied, not sending the relay-related information to the network control node when the threshold is not satisfied; wherein the relay threshold information comprises: a link quality measurement minimum threshold of a serving cell, and/or a remaining power level threshold and/or a mobility state threshold; the relay-related information comprises a relay intention/interest/indication to become the relay node of the user equipment. sending , by a user equipment, relay-related information used for determining a relay node to a network control node; and when the user equipment is determined as a relay node, receiving , by the user equipment, device-to-device communication relay configuration information sent by the network control node; characterized in that : before the user equipment sends the relay-related information to the network control node, receiving, by the user equipment, a relay reception resource pool and relay threshold information sent or preconfigured by the network control node through broadcasting; judging, by the user equipment, whether a relay threshold is satisfied according to a measurement result of measurement performed to the serving cell, and sending the relay-related information to the network control node only when the threshold is satisfied, not sending the relay-related information to the network control node when the threshold is not satisfied; wherein the relay threshold information comprises: a link quality measurement minimum threshold of a serving cell, and/or a remaining power level threshold and/or a mobility state threshold; the relay-related information comprises a relay intention/interest/indication to become the relay node of the user equipment. before the user equipment sends the relay-related information to the network control node, receiving, by the user equipment, a relay reception resource pool and relay threshold information sent or preconfigured by the network control node through broadcasting; judging, by the user equipment, whether a relay threshold is satisfied according to a measurement result of measurement performed to the serving cell, and sending the relay-related information to the network control node only when the threshold is satisfied, not sending the relay-related information to the network control node when the threshold is not satisfied; wherein the relay threshold information comprises: a link quality measurement minimum threshold of a serving cell, and/or a remaining power level threshold and/or a mobility state threshold; the relay-related information comprises a relay intention/interest/indication to become the relay node of the user equipment. <EOS>