As an important system in modern civil law, the right of preemption is recognized in most civil law countries and regions. The preemptive right is also stipulated in the current laws, administrative regulations, judicial interpretations and even government documents. In the process of compiling our civil code, there is no doubt that the system of preemptive right should be stipulated. The new draft of the Civil Code stipulates the preemptive right of the total by shares, which is the same as the existing provisions of the Property Law. When the co-owner has transferred a share of the property to a third person, when they meet the with the third parties same conditions .Other co-owners may request preferential purchase rights. The existence of the right of first refusal is mainly to maintain the existing common relationship, Promote the best use of materials and reduce disputes between co-owners, to safeguard the interests of the group and balance the interests of the third party. When stipulating various kinds of preemptive rights in our current law, we often simply specify the subject, object and conditions of the preemptive rights with only one provision, but there is no norm on the important issues such as the legal nature, legal effect, exercise mode, exercise period and exercise effect of the preemptive rights. This makes it difficult for local courts to find an accurate legal basis in the trial of preemptive rights cases, seriously affecting the uniformity of adjudication standards and the predictability of adjudication results. This will affect the results of the various courts in the case of preemption, and ultimately undermine the authority of the law, and is not conducive to the protection of the preemptor. Considering that one of the conditions for exercising the right of preemption is that the seller concludes a contract of sale with the third party, the primary legal effect of exercising the right of preemption is to establish a contract of sale between the seller and the preemptive right holder, and the contract of sale has its own particularity in the way of establishment and the content determination, so it will be given priority. The general rule of the right of purchase is placed in the part of the contract of sale in the sub-rules of the Civil Code, which is most appropriate both in system and in logic. In order to improve the problems that will occur in practice ,the provisions of “transfer”and the comprehensive factors of “equal conditions”should be further explained.