As the building's outer wall consists of hollow blocks, which hollow holes are transfixion, a technical method of indoor ventilation, which uses hollow holes as channel and takes exhaust blower as the power which fi'equently use in the kitchen and bathroom, was proposed out and carried on the simulation of ventilated effect for a typical room by the CFD method. With the analysis of the simulation result, the effect of ventilation is fine, and the method can solve the question effectively of city and countryside indoor air qu...