Two  pot  experiments were performed at the Experimental Station Farm , Faculty of Agriculture Mansoura university during two successive summer seasons of 2007 and 2008. This work was conducted to study the role of some exogenous applied antioxidant on endogenous enzymatic and non-enzymatic antioxidants under different salinity stress levels of sweet pepper cv. California wonder. The data show that all salinity levels and each of applied antioxidants(presoaking+foliar spray) as well as their interactions slightly increased the contents of different non-enzymatic antioxidants (phenols, Ascorbic and  Glutathione) in both shoot and fruits of pepper plant during the two growth seasons. Moreover SWE combined with highest salinity level treatment was the most effective in this respect.                 Moreover each of salinity stress levels (2000, 4000 or 6000 mg/l) increased Super oxide dismutase (SOD) and Ascorbic peroxidase ( APX) activity  in both shoot and fruits of pepper plants. In addition The data show that any of applied antioxidants (HA, SA, ASA, Tochopherol,   Put.,  SWE ) alone or combined with different salinity stress levels also increased the activity of SOD, APX  enzymes in both shoot and fruits of pepper plant, during the two growth seasons.