Abstract: Leaf senescence of Pseudosasa amabilis var.convexa at flowering and seeding stage was studied in the paper.The distribution of blooming individuals was sporadic and spotted.Blooming started in the early April.Peak season of flowering was during May,and the end of flowering is in June.Then the seed bore in July and blooming individuals tended to be dead.Unflowering individuals grew normally.The experiment results indicate that from the start of flowing to the end of seed bearing,the content of chlorophyll and the soluble protein in the leaves of flowering bamboo individual decreased rapidly.The content of chlorophyll was only 0.45 mg/g at last,and decrease of the content of soluble protein arrived 70%.Meanwhile,the activities of superoxide dismutase(SOD) and peroxidase(POD) in leaves decreased,the ratio of decrease of them was 15.6% and 80% respectively.As a result,leaves of flowering bamboo senesced and died off.