Abstract: The nutritional function of different Se levels and the Se—S interaction were studied on the condition of spraying fixed S and different level Se on the garlic(Allium sativum L．)．1 1 mineral elements，4 kinds of quality components were determined． The trial data were analyzed by the Principal Component Analysis(PCA)and the Factor Analysis(FA)．The result showed，the main mineral factors(X1、X，、X )model accounted for 83．572％ of the total variation in the data．The linearity relation between the nutri．tional quality and main mineral factors were simulated．and the relation showed ll mineral elements c0uld be divided into 3 common factors(allicin factor，Se factor and Vitamin C factor)which significantly related to the garlic quality．Se，S and Se—S cooperated spraying improved the garlic nutrition quality(organic Se，
ratio of organic Se，vitamin C and allicin)by increasing mineral nutrition．And if the available Se and S Were sufficient in the soil，the positive effects of S nutrition under the lOW and medium level Se(Na，SeO 20—40 mg·L^-1)cooperated with the fixed level S[(NH₄)₂SO₄ 2500 mg ·L^-1were found，namely the Se—Sproportion were about 1：125—62．5．

Key words: Garlic(Allium sativum L．), Selenium, Sulphur, Nutritional va1ue