The natural ventilation is a technical means adopted widely in energy
conservation building .According to the theory of natural ventilation, it can be
divided into some forms including the natural ventilation by wind pressure, by
different pressure in temperature, by combination of both and mechanically
supplementary ventilation. In this paper, the theory of natural ventilation is
analyzed with examples, then, the theory of double layer enclosure and the
natural ventilation in high -rise building are discussed.