Of safety technologies of coal mines summarized as a handbook, described is the safety technology on ventilation control. Factors in drawing up a plan for ventilation control are increasing due to the mine structure being deeper, more complicated and larger-sized, increasing gas emission and temperature rises of rock mass. Air flow rate and frictional resistance are calculated by measuring wind velocity, temperature, humidity and ventilating pressure. Various ventilation methods are devised according to the mine structure. Ventilation network of the mine consists of mine roadway, working face, air duct and clearance where leakage flows. The fire escape route must also be considered. The following factors for the ventilation plan should be considered: structure of the ventilation network, pressure loss, features of blowers, natural ventilation pressure, constant-flow airway where constant air flows, and leakage. As a theory of ventilation elucidation, a Hardy-Cross method and a panel point method, which are the succesive approximation method by computer, are explained showing calculation examples. 17 refs., 60 figs., 35 tabs.