In order to master the smoke control method of double-source fire in road tunnel section, numerical calculation method is adopted to conduct in-depth analysis and research on the control wind velocity, smoke return length and smoke temperature of double-source fire in tunnel section. The results show that: Under the double fire source fire scenario, due to the dispersion of the fire source, the critical wind velocity is mainly controlled by the two fire sources, when the power of the two fire sources is the same or similar, there is a certain superposition effect between the two fire sources, and the critical wind velocity is affected by the joint influence of the two; When the power of the two fire sources is different, the critical wind velocity mainly depends on the power of which is larger, and the role of the power of the smaller fire source is not obvious. The critical wind velocity of double fire source (5MW+5MW) fire is 2.5m/s, and the critical wind velocity of double fire source (20MW+20MW) fire is 3.3m/s, which is increased to a certain extent compared with the same power of single fire source, and the critical wind velocity of double fire source (20MW+5MW) fire is 3.2m/s, which is the same as that of single fire source 20MW fire. The smoke temperature is also affected by the power of the two fire sources,as is the critical wind velocity. The smoke back-layering length is controlled by the fire size, and with the same ventilation rate, the smoke back-layering length increases with the increase of fire size, which is not related to the power of two of the fire sources.