Abstract: Unlike the era of development and growth, most of built-up areas are in imminent need to provide public spaces for citizens through the places available to the public in order to improve the quality of daily life. However, since, urbanization has been completed, it is difficult to secure public space easily due to the problem of infringement of private land and equity for citizens. In order to achieve this goal, there has been provided legal systems that can secure public contribution such as land donation, restitution of development gains, gratuitous contribution, prior negotiation system and so on. In the 403 cases of land donation made in Seoul, roads, parks and green spaces total ratio were 86.4% and only 10.8% was applied to other facilities for the internal users. In the case of the restitution of development gain, the accidental profits have been generated as the development proceeds. However, it is highly probable that the contribution areas will not be entirely provided because these can also be provided outside of the area under the judgment of the administrative department. In addition in the case of public voids, it is not literal public contributions because they do not actually transfer land ownership along with the incentive provisions in the district unit plan. However, it is a voluntary public contribution because it is recommended to provide a design tailored to urban flows in areas such as special design. Unlike other systems, the prior negotiation system has been applied to increase the efficiency of recycling and utilization by disposing of infrastructure with the goal of fostering strategic regional base of large-scale site with high potential land use and revitalizing urban development. Among above 73 developed examples, public contribution of more than 5,000 m² was 20% for land donation (district unit plan), 23% for land donation (urban environment maintenance project), 17.2% for public voids. As for ratio, the prior negotiation system provides the highest public contribution rate. Therefore, it is necessary to secure the utilization and diversity of space more easily and to revitalize the area by recycling the infrastructure in which the hollowing phenomenon occurs. Therefore, public contribution should be secured by using the prior negotiation system.