Abstarct: Decoherence is a physical phenomenon that is due to the interaction of quantum systems with envirenment. In fact the envirenment-induced dynamical destruction ofquantum coherence is called decoherence. Existence of decoherency is unavoidable in many quantum systems. Amplitude damping and phase damping are just two example of decoherency which affecting on superposition of states and multipartite entangelement. Decoherence suppression may be accomplished in a number of ways. Quantum error correction and decoherence-free subspace are two ways of decoherence suppression that both of them need larger hilbert space. In this thesis we study a decoherence suppression method which called uncollapsing. We show that qubit decoherency due to zerotemperature energy relaxation can be almost completely suppressed by using the quantum uncollapsing (measurement reversal) procedure. To protect a qubit state, a partial quantum measurement moves it toward the ground state, where it is kept during the storage period, while the second partial measurement restores the initial state. So decoherence due to amplitute damping shown to be effectively suppresed by using two weak quantum measurement befor and after the decoherence channel. Entanglement is a vital resource in many quantum information and computation applications that decreases because of the interaction of the system with envirenment(decoherency). In this thesis we will show that using uncollapsing is also effective to protecting entangeleme. In detail this method have been studied in entangelement protection from amplitude damping of zero and nonzero temperature.