Abstract: A scheme of two-way quantum teleportation is proposed ,via quadripartite entangled state as quantum channel to teleport unknown general one or two qubit and restricted three qubit state.First of all,two sides of communication ,which are far away from each other,share two pairs of quadripartite entangled state in advance.The entangled state will present some special characteristics, which are different from the general two particles,when the number of the particles is more then 3. This multi-particle entangled state is called as cluster state which shows higher correlation and concurrence.Just in time ,as one of the cluster state,quadripartite entangled state is very suitable as quantum channel .When communicating,two sides perform the quantum projection measuresment with the appropriate orthogonal basis vectors,separately. Then they send the measurement results each other by the classical channel .The two sides can choose appropriate unitary operation on his own qubits according to the obtained measurement results to obtain the unknown state,respectively.

Key words: Quantum communication, Two-way Quantum Teleportation quantum measuresment, entangled state