Abstract: The benzene of volatile organic compounds（VOC）is a highly carcinogenic，disabling and teratological toxic pollutants in indoor environment. To ensure human health，the Ministry of Housing and Construction proposed a strict limit standard for benzene and TVOC in indoor environment.The pollutants of benzene and TVOC were separately determinated with the direct injection gas chromatography，but the results of the two methods for determination of benzene had quite poor comparability. A new method has been established，we followed the definition of the standard，sampled with Tenax- TA tube and took the thermal analytical temperature of 250℃ ， to optimize the determination conditions of chromatograph，for determination of the benzene and TVOC. The method is simple and low cost；the results are more reliable，reproducible，rational and accurate.

Key words: benzene, total volatile organic compounds（TVOC）, direct injection gas chromatography, eight kinds of traceable components in TVOC