Taking the dynamic optimizing design of a high-rise comprehensive office building in Baiyun District,Guangzhou as an example,this paper aims to explore the architectural optimizing design for the lobby of a high-rise comprehensive office building.By fully tapping the optimizing potential of the original construction drawing design,and starting with the functional,artistic and humanization needs of the lobby space,a series of optimizing strategies are proposed,including canceling the corridor on the second floor of the original construction drawing design lobby,opening up the existing safety evacuation exit,adding safety evacuation exit,etc.The optimizing design improves the using and visual experience as well as the overall image and quality of the high-rise comprehensive office building.