Scientific construction of computer-aided design system has a positive impact on the effective implementation of urban garden planning. It makes the formation of design faster and more convenient. In research and discussion process of this paper, the specific discussion was binding with the complex computer-aided design strategy. A proposal idea of strategy had been fully explored in order to make the basic constituent elements more clearly. There are main constituent elements in complex computer-aided design strategy. They are the date entry of regional basic geographic information, data analysis of local climatic conditions and architectural parametric design strategies. In these three aspects, the scientific of complex computer-aided design strategy could be explained systematically. In conjunction with this discussion process, a further exploration had been done for solving method of design techniques. A full exploration had been done in order to build the technical supports for logical construction and conceptual design. From these explorations, the key technique for computer-aided design system could be built. Lastly, Finally, there is an effective research on theapplication of the actual construction process. This research would make the intelligent features of computer-aided design systemfully reflect. It provides a more powerful theoretical support for the urban garden planning and during the implementation process. All above are the main ideas in the study process of this paper. The main content are shown at the same time. This provides a strong basis for its tightness in study process.