Abstract: With the deep study on the node location method, great programming practices showed that the original node location method algorithm was not complet ed and would often cause wrong distinguished phenomena.Thus an improved method was provided and a completed program diagram was provided.The application of t he improved node location method showed that as for a same scale ventilation network, the wrong distinguishing rate of the original node location method was high and was 39.8%. The wrong distinguishing rate of the improved node location method was 0.The improved node location method could rapidly and accurately distinguish the diagonal air way and could be widely applied to analyze the reliability and stability of the mine ventilation system.