Wind,floating climate factor in nature,is one of the important components of urban eco-systems.Wind environment can promote communication between hot and cool air and be a media between metropolitan and ecological area.It can also enhance the ability of cities to suit hot climate.Basing on simulation CFD,this paper focused on a new way of the saving-energy design in urban planning.This way intended to build a few kinds of urban ventilation channels.The methods for increasing area's quality of ventilation and reaching the aim of lowing down the temperature of hot-island in summer and saving energy by using natural resources and efficient planning is introduced.This paper also discusses the issues of ventilation channels' feasibility,necessity,building types and so on.Then it displays a series of computer-aided research in wind field.