A enterprise being engaged in merge process has been chosen as subject investigated. Through study of case analysis, this article tried finding the impact of organization’s merge on employees’ psychological contract, and qualitatively summarizing valuable conclusions as following: stability of employee’s psychological contract is more easily influenced during a merge process. After psychological contract breach, there exists self-repairing mechanism and organizational repairing mechanism which help repair broken psychological contract and bring them back to stable and balanced state. If a broken psychological contract cant be repaired successfully through self-repairing mechanism, it will degenerate into a violated psychological contract.