The purpose of this study was to analyze the influences of influences of intrinsic and extrinsic rewards on teachers' work motivation to suggest an alternative plan for the improvement of their work motivation at elementary and secondary schools. The data were collected from 310 teachers working at elementary and secondary schools in Kyonggi and Chon-nam. The questionnaires included 64 questions related to six demographic factors, six intrinsic and six extrinsic reward variables. They were measured on Likert's five-point scale. The data were analyzed with Multiple Regression Analyses at p < .05 or above using SPSS program. Work Itself, Opportunity for Growth, and Recognition and Policy/Administration and Human Relation were found influential to teacher motivation. Work Itself was the most important factor for teacher motivation; Opportunity for Growth the next, Human Relation the third, Policy/Administration the fourth, and Recognition the last. On the other hand, other variables including Achievement, Advancement, Responsibility, Salary/Fringe Benefits, Job Security, Supervision Skills and Working Condition were not influential to teacher motivation. In considering that these variables have been argued to have an effect on work motivation, the results are somewhat surprising.