The purpose of this research, based on Maslow's theoryof need hierarchy and related studies, was to analysis thepsychological need strengths of Elementary School Teachersand to explore the relation- ship of sex, age, educationalbackgrounds, working tasks, self concept, teacher attitude andwork satisfaction with psychological need strengths. The Teacher Need Strength Inventory > Tennessee SelfConcept Scale, Teacher Attitude Inventory, TeacherSatisfaction Questionnaire and Questionnaire of TeacherBackground variables were administed for 1,156 elementaryschool teachers. The major findings of this study were asfollows ':1. The safety need strengths of teachers' response onTeacher Need Strength Inventory was highest but the esteemneed strengths of teachers' response was lowest. 2. Women had significantly better psychological needstrengths than men. 3. Teachers in the five different age level had nosignificantly order relationship. 4. Teachers with normal college had better psychologicalneed strengths than those with junior normal college. 5. Teachers had better psychological need strengths thandidectors. 6. The strengths of relationship in sex, ages, educationalbackgrounds and working tasks with psychological needstrengths reflected low association. 7. self concept, teacher attitude and work satisfaction were signi- ficantly positively correlated with physiologicalneed strengths. 8. Seven predictive variables which made significantcontribution to the predictor of psychological need strengthswere identified and ranked in the order of (a) teacherattitude, (b) self concept, (c) work tasks, (d) sex, (e) age, (e)sex, (f) work satisfaction, (g) educational background. 9. There was a significant canonical between the sevenpredictive variables and the five criterion variables. Threecanonical factors were identified.