This test used the breed variety Heinong No. 48 as test material. This work was carried out in the gardening experimental center’s greenhouses of NEAU in 2008, we had three different treatments: normal water supply(80%-85% of field capacity), mild drought (65%-70% of the field capacity) and moderate drought (50%-55% of field capacity). We treated soybean seedings under drought stress, then discussed the effects on morphological characters , physiological indexes and microstructures of soybean seedli...