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The experiment was carried out to study the effects of seedling-strengthening agent (SSA) on morphological and physiological characteristics of rice seedlings. Adult seedling rate, seedling height, dry matter weight and protective enzymes activity were studied with Yux-iangyouzhan. The results showed that under mode A (SSA applied at the bottom of the floppy disk) the seedlings showed the difference. While applying 10 g SSA to each dish under mode A, adult seedling rate reached 73.77%, significantly improved by 17.16% than CK; Seedling height was significantly shortened by 43.51%, and dry weight per unite plant height was significantly improved by 50.53%; SOD and POD activity in leaves were higher than other modes, thus increased antioxidant capacity, then strengthened the rice seedlings. [ABSTRACT FROM AUTHOR]