This thesis has two main goals to achieve: The first is the development of a new design process of the visual impact analysis and assessment with the application of computer simulation tools. The second is to discuss the role, the timing of the application of CAD in the design process.Through the literature and analytical reviews, as well as the experiment case practice in the laboratory, I developed a new design process of the visual impact analysis and assessment(VIAA) with the application of computer simulation tools, and the application timing of computer aided tools and the relevant techniques. finally, I tested the validity of this thesis by the practice of the case of the traditional urban space programming of the East Hall Square of Hisn-Chu, and then refined it.
