With the growth of the population and the development of economy, we are now entering an era of water shortage. People begin to recognize the value of harvested rainwater in solving the water problem, especially in cities. But the rainwater harvesting system is often considered as a separated part in the urban design,and only its functionality is addressed, which brings about the problem that it will take up the precious urban field. This paper proposes to combine the rainwater harvesting system with the landscape design, and discusses the relationship between the rainwater harvesting system and the landscape design, to find out a proper way of their combination in both functionality and aesthetic. It is hoped that this proposal may provide some food of thought in the future design.