Abstract: In order to study the combustion characteristics of ancient building wood components under fire, the combustion features such as ignition time, critical radiation intensity, heat release rate and CO2 volume fraction in combustion gas of ancient wood were studied by cone calorimeter. The results show that the critical radiation intensities of samples with 3 different thickness are 8.81, 9.40，10.55 kW/m2 respectively. The increase of thickness will extend the ignition time, increase the critical radiation intensity, and reduce the peak value of the double peak curve formed by the heat release rate of the material, . And the CO2 volume fraction curve is consistent with the curve drawn by the heat release rate. The combustion characteristics of samples with the same thickness show significant differences under different radiation intensity. Compared with the relevant combustion characteristic parameters of new wood, the critical heat radiation intensity and ignition time of aged ancient wood decreased, and the average heat release rate within 5 minutes was higher. The research shows that the combustion characteristics of wood components of ancient buildings have significant changes, which can provide a reference for the study of ancient building fire.

Key words: ancient pine material, material thickness, thermal radiation intensity, cone calorimeter, combustion characteristic