Abstract: The dry-distilled essential oil, wood vinegar, wood tar, charcoal and combustible gases were obtained from fir root by retorting. The release of non-condensable flammable gas in different temperature ranges and the composition of CO, CH4, H2 and CO2 were studied. Results showed that CO2 was the main ingredients of non-condensable gas between 150-260℃, followed by CO; CO2 content decreased significantly between 260-490℃; CH4 levels increased significantly up to 26%; the final volume fraction of H2 reached 12%; clean energy source with high thermal value mounted up to 6281 kJ/m3 and the average thermal value more than 8 374 kJ/m3. The Carbonization essential oil, wood vinegar, wood tar, charcoal and combustible gases were obtained with the yield of 9%, 33.5%, 5.5%, 32.9% and 15% respectively. All of the fir roots were converted into products with the total conversion rate more than 90% without waste. The method proposed in this paper realizes the comprehensive utilization of resources and green environmental protection.