Evaluation is a process of description and value judgment. The purpose of evaluation, as Stufflebea et al. put it, is "not to prove, but to improve." For schools, the purpose of evaluation is to improve school education, to promote education accountibility, to accelerate school's development, and overall to make our school a better one. Therefore, school evaluation should follow several guidelines: objective, democratic, comprehensive, individual, multiple, integrative, dynamic and continuous. However, school evaluation in Taiwan didn't achieve satisfactory results after years of practice. Taipei City Government's Bureau of Education, aiming to realize goals of the educational reform, to increase school effectiveness, and also to provide an indicator for principal selection, appointed the professional to conduct a research on school evaluation of Taipei City's junior high schools. Based on relevant experiences acquired from joining researches and evaluations, the researcher made an analysis and concluded that school evaluation of Taipei City's junior high schools has the following characteristics: (1) doing local researches, (2) back to school effectiveness, (3) more teaching evaluations, (4) practical and clear indicators, (5) emphasis on dynamic mechanism, (6) adequate time to evaluate, (7) evaluation appropriately quantified, (8) evaluation in accordance with authority, (9) emphasis on school characteristics, (10) negotiating an agreement over evaluation. Finally, suggestions are made focusing on the implementation and development of school evaluation: (1) institutionalizing school evaluation through combining with principal selection; (2)"student achievement" should be added as the indicator; (3) evaluation should be objective and should put an emphasis on interaction; (4) The result of evaluation should be announced and properly explained; (5) Formative evaluation and summative evaluation should be made together; and (6) School-based evaluation should be transformed and developed.