Abstract: The pollen grains of 11 species and 2 varieties belong to genus Syringa from China were examined under light microscope and scanning electron micr-oscope. The distinction of pollen morphology between species were very cl-ear under scanning electron microscope but obscure under light microscope.All of them are 3-colporate except S. vulgaris which are 3-colpate. In add-ition, morphological characters of pollen were treated as P. A. C. by com-puter and the results was analysised with Two-dimensional ordination and Three-dimensional ordination. It seems that the width/lenghth of aperture the principal elements in pollen grains classification.