Abstarct: Quantum cryptography describes the use of quantum mechanical effects to perform cryptographic tasks or to break cryptographic systems. The most well known and developed application of quantum cryptography is quantum key distribution. QKD describes the process of using quantum communication to establish a shared key between two parties without a third party (Eve) learning anything about that key, even if Eve can eavesdrop on all communication between Alice and Bob. This is achieved by Alice encoding the bits of the key as quantum data and sending them to Bob; if Eve tries to learn these bits, the messages will be disturbed and Alice and Bob will notice. The key is then typically used for encrypted communication (secure transmission). Following the discovery of quantum key distribution and its unconditional security, researchers tried to achieve other cryptographic tasks with unconditional security. Now, the main question is that do Parties always get the identical key? According to QKD protocols if one of the party attempt to cheat, they cannot get the identical key. In order to overcome this problem, the Bit Commitment (BC) idea was proposed and it was predicted that, if QBC apply to QKD schemes, the cheat will be detected. A bit commitment scheme (between mistrustful parties) allows Alice to send something to Bob that commits her to a bit b of her choice in such a way that Bob cannot tell what b is, but such that Alice can later prove him what b originally was. The claim of quantum cryptography has always been that it can provide protocols that are unconditionally secure, that is, for which the security does not depend on any restriction on the time, space or technology available to the cheaters. We deal with a brief review on the impossibility of quantum bit commitment and Then express two BC protocols: 1."Unconditionally Secure Bit Commitment by Transmitting Measurement Outcomes" that baxsed on Minkowski causality and the properties of quantum information, 2." unconditionally secure Cheat Sensitive Quantum Bit Commiment" protocol which guarantee that, if either cheats, the other has some nonzero probability of detecting the cheating. This protocol is cheat sensitive non-relativistic bit commitment protocol which uses quantum information to implement a task which is classically impossible.