The thesis is a theoretical research of urban design. This research will discuss some issues like why the commercial walk space of the big or media-sized cities in china looks like the same. Compared with the differences between domestic and foreign walk space, the development direction will be point out. According to theories of system theory and urban form, three levels for commercial pedestrian space design were brought forward, street, buildings, and traffic. Based on this, a systematic design frame was set up; And you also can know how the three levels have effects on the networks. At last a method of reconstructing the pedestrian system will be given out. So we can provide positive suggestions for future.
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