Fenghuoshan and Kunlunshan Tunnels lie in hinterland of Qinghai-Tibet Plateau

of which the altitude is about 5 000 m. The problems of the life and health of workers

the protection of permafrost and the quality of tunnel become very severity because of lack of oxygen

coldness and bad geological condition in permafrost regions. The governing differential equations of construction circumstances temperature field and the surrounding-rock temperature field are established. The simulation of temperature field

the development and application of the construction ventilation and heating unit

the system of making and supplying oxygen

and the system of monitoring and controlling made the general controlling of air temperature and air quality become realism; it can provide important technology guarantee and appropriate working condition.