Abstract:The cavity ice is a natural marvelous spectacle Linzhou Henan.Here,it ice from March to August each year, later, the ice thaw in winter.The reason of phenomenon winter-summer inversionly relate closely with the powerful effect as chimney producing by here special geological structure. The cavity ice locate high above sea level,the altitudinal difference is large with the lowest point of this area. The difference form the immense vertical chunnel by producing the enormous thick-bedded quartzose sandstone and faults structure. The chunnel resemble concealed chimney of few hundred metres altitudinal difference. Temperature is higher in summer,air pressure is lower,the effect as chimney is stronger,the volume of expansing gas dashing out the chimney mouth is greater,the absorbing heat is more by the first law of thermodynamics,it cause that temperature is lower nearby in ground until it ice. AS air pressure is higher than the chimney mouth in winter, the cavity gas diffuse out by consuming energy, it cause that temperature is higher nearby in ground.