Abstract: BTEX are a general designation of benzene, toluene, ethylbenzene and xylene, which are commonly found together in crude oil and oil products. These compounds are also produced as raw materials for the manufacture of pesticides, plastics and synthetic fibers. BTEX exist abroad in air, water and soil environment, and cause serious adverse effects on corresponding ecosystems as well as human health. Pollution sources and distribution characteristics of BTEX were analyzed in various mediums, and the transfer and transformation in environment were discussed. Influences on human health especially in the aspect of reproductive and developmental toxicity were reviewed. The pivots of further researches of BTEX were suggested.

Key words: High altitude, Coppice tree, Disturbance, Analytic trees, Youth broken-down