With the advance of the “threeright separation”policy, it is necessary for the legislation to follow up. The policy becoming the law needs to follow the inner logic of law system, and should not directly use the policy terms. Based on the connotation of contracted land management right, because it does not contain the contracted right, therefore, the legal explanation of threeright separation should not decompose contracted land management right into contracted right and management right. Based on the decomposition theory of “mother and child rights” structure in the traditional civil law, the separation of “threeright” should be legally reflected in the following law structure：Contacted land management right of rural land comes from collective ownership, the management right of the land come from contacted land management right of rural land. In order to get the subject of “threeright separation”policy and the logic of system and to achieve the goal of rural land transfer and suitablescale management, the nature of management right of the land should be the characteristics of rights in rem.