Hemlock and cedar are the mainstream timber for making sweat steaming houses. Among them, red cedar is relatively high-grade and has a high cost. The Chinese fir has the characteristics of hard quality and clear and natural grain. The essential oil of red cedar wood is the raw material used for making perfume. Its wood itself has natural fragrance, which can refresh the mind and relieve nerves. Red cedar wood is soft, but its waterproof is excellent, it is said that the red cedar placed in water for 50 years will not decay.