Along with the domestic housing commercialization and limited urban land, high-rising residential has become the main form of housing, and even in some big cities super-tall residential have emerged, sunlight problems become needs to be main addressed in the urban planning and architectural design process. How to guarantee a certain volume ratio within a limited land, and to fill national and local stands about sunligh is a difficult problem in the planning and architectural design departments. This paper introduces the current domestic sunlight plot optimization tools and several preliminary solution for plot optimization are discussed.