The dynamics of worldwide competition and technological innovations are applying on business are more important than in the past to make it to learn and adapt companies to increase the organizational performance. Whether it is private or public employees and leaders in an organization are the most critical strategic assets and by improving their skills and knowledge organization might act successfully and remain highly competitive within their domain. The purpose of this study is to determine the key the impact of transformational leadership on employee's performance among employees in IWPPs, Saudi Arabia, and provide suggestion how firms could improve their employee performance through effective programs. The study employs exploratory design, with quantitative approach and a stratified random sampling method using self-administered questionnaires. Structural Equation Modelling (SEM) approached and AMOS software was used as statistical analysis tools for analyzing data. The final structure model that uses maximum likelihood estimation analysis confirmed a goodness fit of the data. The findings from the testing of the hypotheses indicate a positive significant relationship between: Transformational Leadership on Employee’s Performance .four paths from Idealized Influence Behavior, Idealized Influence Attribute, Individualized Consideration, Intellectual Stimulation, on Employee’s Performance were statistically significant. Conversely, the significant of the path from Inspirational Motivation, on Employee’s Performance were not supported as statistically significant.