With the promotion of block system, there will be breakthroughs in urban space. Urban renewal in the core of the old town brings new opportunities for community greenway construction. This paper takes Hefei city as an example to study the inner drive of block system for greenway construction of the old town core community and to analyze the importance of community greenway construction in the new round of urban renewal. It not only provides a solid theoretical basis for the feasibility of greenway construction in the old town's core community, but also makes a positive discussion which takes the construction of community greenway as the breakthrough point.