Abstract: This paper deals with the pollen grains of 16 genera, 46 species, 2 variety in Chinese Convolvulaceae. Acomparative stu-dy on the pollen grains was carried out by means of scanning electron microscope and light microscope. The pollen grains of the family Convolvulaceae are eurypa-lynous. Tricolpate is the basic type. According to the shape, position and number of the aper-ture, the pollen grains are divided into the four types-tricol-pate, 4-11 colpate, pancolpate and panporate. On the basis of palynological data were discussed taxonomical position of the genus Cuscuta among the family Convolvulacaee and evolutionaltrend of the aperture of this family.