Abstract: Abstract: The experiment studies the effects of SA on seeds germination and Anti-cold of Hibiscus syriacus L seedlings by using five different concentration ( 0.1 mg / L, 1 mg / L, 10 mg / L, 100 mg / L, 1000 mg / L )of Salicylic Acid(SA)to soak Hibiscus syriacus L Seeds. The results indicated that 10mg/L and 0.1mg/L SA improves the Hibiscus syriacus L Seeds germination rate(GR) and germination power(GP),but other concentration SA is prohibitive;the content of proteins and the content of carbobydrate were increased,while content of MDA was declined in Hibiscus syriacus L seedlings in 2℃.Result from cluster analysis shows that SA can enhance Anti-cold of Hibiscus syriacus L Seedlings, and 10 mg / L ～ 100 mg / L SA is the best treatment .