Abstract: Volatile organic compounds （VOCs） emitted by Pinus armandii were collected by the method of dynamic headspace in Beijing in winter and analyzed by ATD\|GC/MS. The results showed that: 105 kinds of VOCs belonging to 9 classes were identified， 39 kinds of VOCs were the main compositions. Alkene was the main VOCs and alkenes relative concentration was up to 92.12%. Monoterpene like （1R）\|（+）\|α\|pinene， α\|pinene， camphene， （1S）\|（1）\|β\|pinene， β\|pinene， myrcene， D\|limonene and terpinolene were the main alkenes. The total emission rates of monoterpene in winter was 0.68 μg·g-1·h-1， and D\|limoene had the maximum emission rates. Monoterpenes had bactericidal and bacteriostatic action， so the contribution of Pinus armandii to the ecological environment in winter could not be neglected.

Key words: Pinus armandii, volatile organic compounds, monoterpene, winter, quantitative analysis