Abstract:The famous historical and cultural cities have rules of camp and construction rules of streets and alleys, which have accumulated the history and culture and achieved the urban style and form. Under the development path of improving the quality of urban stock, cities focus of renovation and improving the quality. Cities have formulated multi-level renovating guidelines to coordinate the renovation and updating of the physical space of streets and alleys. The street space is not only achieved in the material interface, but also closely related to the living behavior of the people in old city. People's living behavior constitutes the scale logic in the construction rules of traditional space, meanwhile the dimension plays a vital role in the survival of style and features. Therefore, the dimension in the construction rules is important for updating and improving the quality about the traditional space.