This paper empirically examines relationships among corporate strategy, competitive advantage of information technology(CAIT), and organizational performance. Effects of information technology on the linkage between corporate strategy and performance is investigated and CAIT measures suggested by Sethi and King(1994) as well as Sung(1997) are tested for verification. Research results confirm that information technology provides several traits of strategic advantages such as efficiency, threat, functionality, preemptiveness, and synergy and significantly contributes to corporate performance. CAIT measures developed by Sethi and King show strong reliability and validity, Generally, service industry firms show more strong relationship among CAT strategy, and performance than manufacturing industry firms. The findings reinforce the accepted belief that alignment between corporate strategy and CAT is critical for firms to attain sustainable competitive advantage, subsequently enhances corporate performance and competitive position against rivals, potential entrants, substitutes, suppliers, and buyers.