The study was undertaken on reviewing of impact of the strategic planning on performance of planning firms in Kigali Special Economic Zone in Gasabo District. The descriptive design was used because it ensured complete description of the situation. The target population of interest in this study comprised of 199 organizations in Kigali Special Economic Zone in 2020 Gasabo District involving in strategic planning of their businesses. The sample size for the study was selected from the organizational performance in Kigali Special Economic Zone in Gasabo District. The study targeted a sample size of 60 firms. The study adopted non-probability purposive sampling method to arrive at the participating organizational performance. The study performed data collected through a questionnaire structured to meet the objectives of the study. Descriptive statistics was undertaken to analyze quantitative qualitative data using content analysis. The findings strongly acknowledged that strategic planning is the foundation that improves the business processes and ultimately reduces the internal costs of operation. The study concluded that there is a definite strategic fit between the needs of the environment and what the business offers, as well as what the business needs vis a viz what the environment can provide. The study also concluded that there is a need for firms to analyze the external environment pertaining what they do. This is great importance for researchers and firms as it helps them comprehend the motivation of firms’ activities and helps them to take appropriate action and respond to the changing environment.