In order to explore adaptive capacity of Oligostachyum lubricum to different soil water content,we investigated changes of physiological activity in leaves such as ion leakage,MDA content,chlorophyll content,Chl a/Chl b,Chl/Car,SOD activity,POD activity,proline content and soluble protein content in 58-day-experiment.2-year-old O.lubricum seedlings were potted with different soil moisture contents:<30%(T₁),40%～50%(T₂),60%～70%(T₃),80%～90%(T₄) of field capacity and root flooding(T₅),which were controlled by measuring pot soil water content and watering every day.The result showed that:(1)Ion leakage,MDA content,Chl a/Chl b,SOD activity,POD activity,proline content and soluble protein content increased significantly while chlorophyll content carotenoid content and Chl/Car decreased significantly in treatment T₁ with the increase of treated time.(2)The physiological characteristics except carotenoid content and proline content started to change after treated 14 days in treatment T₅ in ways that was the same as treatment T₁.All leaves became dry and fell off after treated 14 days by T₁ and 28 days by T₅.(3)All physiological characteristics in treatment T₂,T₃ and T₄ finally stabled at the level before treatment after changing for some days.The results indicated that O.lubricum injured seriously and even die in soil with less than 30% relative moisture content and grew well in soil with 40%～90% relative moisture content.O.lubricum could live for 28 days when root were flooded and would die if root were flooded for more than 28 days.