Abstract: Leaves of Cymbidium ’old friend’ were treated with SA and 6-BA on water deficiency.It was tested not only the endogenous hormone such as IAA,ZR,ABA but the activity of protect enzyme SOD and CAT and MDA content.Results showed that application of SA within the concentration of 0.5～4.5 mmol/L improved the IAA content in sprout,and 6-BA within the concentration of 2.5～4.5 mmol/L improved the IAA content too.SA within (0.5～2.5 mmol/L) improved ZR content and 6-BA within 2.5～4.5 mmol/L also improved ZR content.All SA and 6-BA winthin 0.5～4.5 mmol/L restrained ABA content.SA within 0.5～4.5 mmol/L and 6-BA winthin 2.5～4.5 mmol/L improved the activity of SOD and CAT,lowered MDA content.SA within 2.5～4.5 mmol/L improved net photosynthetic rate and water using efficiency.The 6-BA within 2.5 mmol/L had the effect of increasing water (using) efficiency.