A ventilate corhart with gas screen wall comprises a castable refractory and 0.08 to 0.45 weight percent of organic fiber. A gas screen wall is made in the way of vibration pouring. The kernels of the castable refractory comprise fine particles which are less than or equal to 1 millimeter. The fine particles which have the granularity of 0 to 1 millimeter are in ratio of 45 to 55 percent, the rest are powder and micro powder which are less than 0.21 millimeter. The diameter of the organic fiber is less than 0.05 millimeter, and the length of the organic fiber is 4 to 6 organic fiber. The castable refractory not only keeps the originally simply vibration pouring molding characteristics and fine refractory characteristics but also form a micro-pore channel which is easy to control in the body.