Paper will use "reciprocity" as explanation for each a different object after appropriate and borrow of each other in mutual information, then turn out to be a beautiful scene, rather than the "beauty" of a pavilion or a building of "identity". Through dig the research of "reciprocity" in Chinese traditional garden design, with the western building "identity" in contrast. From the matching relation, laws and generality of Chinese garden design, probe into the use of "reciprocity" in the ways and means in the modern architectural design, at last, to guide the China's modern building design.