While the society of the 21(superscript st) century is increasingly becoming a society of globalized, information-based economy, education in Taiwan, as part of a knowledge -based society, must rethink itself. It goes without saying that principal plays an extremely important role in the development of education. Hence, principals' knowledge leadership must be emphasized in our contemporary, knowledge economy age. Principals' knowledge leadership can manage, share school knowledge, and enable school to be successful and thrive. The conclusions of this research are as follows: 1. Principals should play knowledge sharer, knowledge innovator, knowledge manager, knowledge learner, and information integrator in knowledge economy age. 2. Principals should promote organization to share knowledge, encourage the ability of innovate development, support organization members to learn, constructive follow out knowledge management, and integrate information system during knowledge economy age.