The purpose of the study was to explore the relationship between teachers' professional growth and school effectiveness in Tainan elementary schools. Through analyzing relevant literatures, the author constructed six dimensions of the teachers’ professional growth and five dimensions of schools' effectiveness indicators, and developed the research questionnaire. The samples included 301 teachers randomly drawn from 23 elementary schools in Tainan. The results were as following: 1. The conditions of teachers' professional growth and school effectiveness in Tainan elementary schools were good; 2. The correlation between the dimensions of teachers' professional growth and school effectiveness was positive; 3. Teachers' professional growth has significant predicting power to school effectiveness. Based on the research results, the author provides feasible recommendations for the references to school administrators, educational agencies, and for further research on related topics.