Since 1996, Taiwan has been implementing the Educational Priority Areas (EPA) Program to reduce the achievement gaps between students in different regions. However, according to the results from PISA, TIMSS, PILRS and the Basic Competence Test, the achievement gap has widened between urban and rural students over time. The Taiwanese Ministry of Education piloted the ""Success Program"" from 2014 to 2017, an experimental program in order to reform the EPA Program. This study sought to investigate the implementation of the Success Program. The researcher conducted semi-structured interviews with 26 school principals, division heads and teachers recruited from participating schools and utilized content analysis to analyze challenges, difficulties and compromises during the first two years of implementation. The purpose was to explore the extent to which the Success Program promoted educational change, the advantages and limitations of zone-based intervention, as well as the factors hindering educational change. Suggestions are provided for improving area-based intervention. Results: The results indicate that the Success Program facilitated inter-school cooperation among elementary teachers at the zone level. Besides, the adjustment of remedial teaching and parental involvement strategies were observed at the school level. However, no change was found at the classroom level. In addition, there was a goal displacement at the school level. In terms of zone integration, lacking of administrative power, short of discussion time, insufficient collaboration skills as well as high teacher turnover rate were main challenges of initiating and sustaining educational change. Policy recommendations: (1) Cultivating instructional leaders and concentrating the focus of zone integration on basic competences. (2) Providing instructional guidance and introducing school-based workshops to strengthen instructional practices. (3) Establishing the discussion mechanism between the administrative team and teachers. (4) Providing scaffolding and expert consultations to support collaborative discussions.