As an increasing numbers of people move into the cities, the need of places for community in such cities is required. Urban open spaces have already take a huge part in people`s daily life. It is expected that a high quality of places can be created for people. The urban open spaces design played an important role in modern urban design and planning. Squares and plazas developed a lot in city centres. But there is a problem that it is hard to build new open spaces in the historic city centres as the spaces is very limited. The genesis of this research came from two distinct sources. First, there are a number of factors which influence urban design. The surroundings, memories and the experiences of the city for people can be defined as contexts. ‘Contexts’ constrain and inform all areas of urban design action. Second, there was a need for people to have a special pleasure from the sight of public spaces. With a focus on the urban design, the main factors presented here are the open spaces. The role and meaning of the elements that play in urban design and the ways in which they are designed, developed and detailed are the most important elements for landscape architects to research and consider. In the end of this paper, the author developed a series of general design process and some design ideas as basis of design model of urban open space for the urban history context extending.