Abstract: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.