Across the globe, the rapid urbanization process has caused a series of urban problems, such as traffic congestion, air pollution, heat island effect, resource shortage and degradation of human settlements environment, which many countries and cities have to face in their development. In the middle and later stages of urbanization, cities no longer regard economic interests as the first demand, but advocate creating better living environment and higher quality of life. In 1984, the World Health Organization (WHO) first proposed the concept of “Healthy City”, and then more and more health-oriented urban projects began to be implemented. People realized that in order to build a healthy city, it was necessary to restore their dominant position in the city and control the growth of vehicles and the spread of lanes. Therefore, the planning session gradually puts forward the concepts of "Reclaim the Right-of-Way" and "Pedestrians First". The Superilles in Barcelona, Spain is such a block repair plan aimed at reshaping street space, restoring street vitality and building healthy blocks. Since the 1990s, Barcelona has faced increasingly serious urban problems, including air and noise pollution, green space reduction, frequent traffic accidents, and degradation of human settlements. In order to solve such urban problems and improve the living environment, the Barcelona authorities have proposed a super block plan-Superilles-aimed to give fresh air and street space back to urban residents. This article firstly reviews the implementation background and development process of the plan. The Superblock Plan is based on the urban pattern and road network laid by the Cerdà Plan. The core of the Cerdà Plan is the urban breathing theory, which advocates reducing the building density and providing green space. However, as the population continues to increase and the building density increases, a large amount of green space is occupied, and the leisure and entertainment functions of the streets are disappearing. Since then, Barcelona has begun to explore the construction of pedestrian blocks, and has put forward “Street Plan”, “Mobility Plan” and “Urban Mobility Plan”. Based on the previous practical experiences, Barcelona proposed the Superblock Plan in 2016. In this plan, the original urban streets are redefined as public spaces, livable places, community spaces and entertainment venues, rather than pure vehicles and pedestrian roads. It combines the original 130 m * 130 m block unit into a 3 * 3 unit network and becomes a 400 m * 400 m super block. The original traffic flow direction is adjusted, which is only used for residential traffic services within the block, emergency vehicles and loading and unloading vehicles. The speed of the vehicle is controlled within 10 km/h to reduce transit traffic. In December, 2019, the Superblock Plan has established implementation pilot in 8 blocks of 6 regions. According to its completion, the author selects the Poblenou block to conduct field research. It is found that the implementation of superblock is conducive to the decrease of temperature, the increase of humidity, the improvement of microclimate and the increase of human comfort in the neighborhood. It can also reduce traffic flow and noise, and improve the safety of the block. At the same time, it can increase the area of public space and green space, improve the comprehensive environment of the block and promote the health of residents. Through the analysis of its update strategy, the author summarizes its implementation experiences into four points. Firstly, it should give priority to pedestrians. Secondly, it should restrict private transportation and provide convenient public transportation. Thirdly, it should adopt a phased and progressive implementation mechanism. Fourthly, it should emphasize public participation. In the process of urbanization, China is also faced with similar "urban disease" problems. Drawing on the successful experience of Barcelona Superblock Plan, this paper puts forward several suggestions on building a healthy city and repairing block space in China. First, it should determine the humanist-oriented space governance method, transform the street to pedestrian priority moderately, elaborate the street space and facilities, and pay attention to the safety of the streets and the diversity of street activities. Second, it should improve the current status of traffic congestion, promote green commute, improve the bus line network and bicycle network, reduce bus waiting time and reduce road parking. Third, it should transform the planning and management mode, promote restoration from the part of whole, and pay attention to the coordination and cooperation among multiple departments. Fourth, it should promote the social inclusive planning, pay attention to “bottom-up” public participation, encourage the community residents, social institutions and civil groups to participate in the planning and action of street reconstruction management, and protect the public’s right to know and supervision.