Abstract: Effects of different sulfur level on photosynthetic characteristics，fresh weight and qualities of garlic were studied by nutrient solution. The results showed when sulfur content was 2.25 mmol · L-1，the photosynthetic parameter（Pn，Gs，E），photosynthetic pigment contents in garlic leaf and the fresh weight of bulb were higher. Quality indicators of bulb (except the soluble protein) were increased gradually with plant growth. Among the different sulfur level，the allicin，soluble sugar and free amino acid contents in bulb of garlic and the allicin，soluble sugar，vitamin C and free amino acid contents in bolt were increased by 48.82%，127.92%，63.58%，10.61%，63.30%，29.07% and 74.16%，respectively. Higher content of sulfur（3.75 mmol · L-1）increased the contents of soluble protein in bulb. At a certain range of sulfur concentrations，with the increase in sulfur level，the garlic branching index decreased and then had no significant change with the increase of sulfur level.

Key words: garlic, sulfur, photosynthesis, quality, fresh weight