Abstract: In order to provide the academic basis of application and popularization, morphological and physiological characteristics of Phalaris arundinacea cv. Picta under drought stress simulated by PEG6000 with different concentrations and different periods were studied in this experiment. The results showed that the percentage of withered leaves, leaf relative electrolytic leakage, contents of MDA and free proline increased gradually; while content of water soluble protein declined firstly and then increased. SOD and POD activities welevated at begainning then declined. Above 7 parameters showed a significant positive correlation with PEG stress. However, the leaf relative water content decreased continuously and showed an obvious negative correlation with PEG stress. According to the morphological and physiological parameters under drought stress, P.arundinacea cv. Picta could be determined as a drought tolerance species and grew normally under moderate drought stress, but it would be damaged under severe drought stress.