The emission fluxes of volatile organic compounds ( VOC ) in the Inner Mongolia during the summer of 2002 were measured firstly. The results show that emission flux of isoprene, the main component of VOC exhibited obvious diurnal and seasonal variation. 2002年夏季对中国内蒙古草原挥发性有机物的排放通量进行的首次测量结果表明,其主要成分异戊二烯的排放有明显的日变化和季节变化。