It is identified that in the past decade, transformational leadership which has become a new paradigm of leadership has become a popular research subject. After the theory is introduced, different writers worked on it in different perspectives. Transformational leadership asserts mobilizing people to the common good through creating a safe place and making integration with ethics, morality and integrity. This paper aims to to assess the role of leadership in project success in case of china wuyi construction zemen bank head quarter project. Data are gatheredfrom the head office Managers & colleagues of china wuyi through formal interviews and questioners. A set of questionnaires was administered to 50 employess of China Wu Yi Co. Ltd. in Addis Ababa, of whom 48 were responded. Qualitative data analysis with the support of interviews and theoretical frameworks has been done. A set of questionnaires was administered to 50 project managers, executive directors and supervisors, program officers in Addis Ababa, of whom 48 were responded. Descriptive analysis was used to analyze the data that gathered through questionnaires. The data gathered through questionnaires planned to be fed into SPSS to make the data ready for processing through graphs, figures, tables and charts, i.e. a descriptive analysis was implemented. The most salient finding was that the role transformational leadership styles were related to project performance. Implication of the study was discussed, and some suggestions were made