Public space is a place for public activities and communication. People in historic blocks include not only local residents, but also many tourists who come to visit. A large number of contacts between people take place in the public space, so the public space becomes the carrier of the vitality of historic blocks. However, nowadays, many public Spaces in historical blocks that lack systematic organization, have unknown uses and ignore human scale have gradually become negative Spaces, which are not easy to use and lack local characteristics. Moreover, it is difficult to give users a sense of belonging, and the positive public Spaces are gradually losing.