In this paper, a bidirectional quantum teleportation protocol based on EinsteinPodolsky –Rosen(EPR) pairs and entanglement swapping is proposed. In this scheme, two users can simultaneously transmit an unknown singlequbit state to each other, and the scheme is easier in actual operation compared with previous work. By utilizing this bidirectional quantum teleportation protocol, a bidirectional quantum secure direct communication scheme is presented and no qubits carrying secret messages are transmitted in a quantum channel which greatly improves security of quantum communication.