Entangled states play an important role in quantum computation and quantum information. A partially entangled state is applied to be a resource and it is proposed a scheme where one can successfully realize copying and orthogonal complementing of an unknown EPR (Einstein-Podolsky-Rosen) pair in a certain probability so that two parties of communication can obtain the EPR state. The first stage of this scheme is to apply a quantum channel, that is a partially entangled channel of three-particle, to teleport an unknown EPR state. Based on the no-cloning theorem, the input state will be destructed at the place of sender in teleportation. In the second stage, through introducing an auxiliary qubit, Alice(a sender) can achieve a copy or an orthogonal-complement copy of the EPR pair with assistance of Victor(a state preparer) in a unite probability. Reestablishment of quantum state is realized in the scheme.