A method is provided for establishing P2P radio connection in wireless communication networks, comprising: the user equipment, as the link probing originator, transmits link probing signals via the allocated direct communication link to another user equipment as the link probing responder, according to the initial probing power provided by the wireless communication system; said another user equipment transmits the ACK message to the link probing originator via the direct communication link when receiving the link probing signals and said link probing signals meet the basic requirement for direct communication; the user equipment, as the link probing originator, monitors the direct communication link, and communicates directly with the link probing responder via the direct communication link after detecting the ACK message from the link probing responder. This method effectively guarantees the procedure of establishing P2P communication between the user equipments in P2P communication course, by utilizing the link probing process of transmitting link probing signals.