Abstract:According to the theory of seepage flow , a new method for simulating the action of the drainage holes in rock2masses is given , which is called as‘pipe to represent hole’. The drainage hole is simulated by conductive pipe as a type of the component s with st rong permeability in permeable medium. The equivalent permeability coefficient of the drainage hole is determined on the basis of the equivalence principle for water head and flow quantity , and it can show the relationship among the drainage property , hole space , and permeability of rock2masses. This method can simulate the drainage effect of holes in different conditions , which will provide a practical method for optimal design of the drainage system in rock2masses.