The present study examined the relationship between teacher training and the implementation of Teacher Performance appraisal and development policy in public secondary schools in Kenya. The study employed the use of Convergent parallel research design. The population target included 48 principals, 48 deputy principals, 727 teachers in public secondary schools,1 District Quality Assurance & Standards Officer (DQASO) and 1 TSC Sub-County director. A sample size of 43 Principals, 43 Deputy-Principals, 218 teachers, 1 DQASO and 1 TSC Sub-County Director were selected. Validity of the instruments was ensured through scrutiny of the items in the instruments by the two supervisors from the School of Education. Bartlett’s test for Sphericity are significant (p .6 for all the subscales of the questionnaire. Reliability was tested through Cronbach’s alpha and an alpha value of 0.700 was reported. The findings of Linear Regression analysis revealed that teacher training accounted for 22.1%, as signified by Adjusted R2 =.221, of the variation of implementation of teacher performance appraisal and development policy among the secondary schools. The Ministry of Education in Kenya should enhance sensitization among school principals on the implementation of the performance appraisal policy in enhancing teacher performance.