Fire, a dangerous hazard in any situation, can take on extraordinary implications when it occurs in a tunnel. In the past, many scholars have conducted research about how to evacuate people from tunnel fires. They have attempted to optimize fire evacuation parameters through theory analysis, simulation, and other methods. Here, the author has presented a new technology called the water curtain smoke discharged instrument and it aims to speed up evacuation in the event of a tunnel fire. Here, the author has analyzed the fire smoke transfer theory and the interaction between smoke particles and high ventilation velocity to decide smoke move law. Then the interaction between smoke and water is simulated and identified so that the water curtain is effective. It is assumed that people can go trough a thin water curtain easily. Finally, the new instrument about fire smoke discharged water curtain is designed and tested. It is very effective and useful when considering tunnel fire designs.