Abstract: In this study, the wild type of Oryza.sativa L. was used as the experimental subject. Using water culture method, under PEG6000 simulating drought condition, the physiology indexes of rice were measured, to understand the effect of Ca²⁺ on drought. The experiment result showed that, under the osmotic stress, a series of changes happened against the stress, including MDA, SOD, POD, proline, chlorophyll, the contents of which were increased. Under mild desiccation（PEG=10%）, when the concentration of Ca²⁺ was 1 mmol/L, the increase of SOD, POD and chlorophyll were most visible, meanwhile the contents of proline and MDA increased with the concentration of Ca²⁺. Under severe desiccation（PEG=20%）, the contents of proline and chlorophyll were remarkably raised, with the increased of concentration of Ca²⁺, and reached the maximum when [Ca²⁺]equals to 5 mmol/L. On the other hand, the activities of SOD and POD reached the maximum at [Ca²⁺]equals to 1 mmol/L..

Key words: Oryza sativa, L. PEGs tress, Ca²⁺, Antioxidant enzyme, Chlorophyll, MDA, Proline