This Dissertation Submitted in Partial fulfilment for the award of the Degree of Master of Science in Procurement and Supply Chain Management (Msc-PSCM) Mzumbe University.The main purpose of the study was to assess the factors influencing the procurement performance in public institutions in Tanzania, a case of GPSA. The study focused on four specific objectives namely: examining the influence of annual procurement planning in procurement performance, determining the influence of financial resource on procurement performance, examining how procurement staff competency influence public procurement performance and identifying the influence of organization structure in procurement performance. The study used a case study design. Data were collected through questionnaires, and documentary reviews. The researcher employed purposive sampling technique in obtaining 131 respondents from the field. Descriptive analysis was used to analyze preliminary data. Factor analysis was applied to test and measure scale of variables, and lastly n simple regression analysis modal was used to measure the relationship among variables. The findings obtained from the filled indicate that the organization prepares the Annual procurement Plan in both short -term and long- term plans, the funds that are allocated for the implementation are not sufficient also, some challenges are encountered. The findings show that the organization is characterized with qualified and skilled personnel who perform procurement activities. Furthermore, the organizational structure influences procurement performance at GPSA. However, reported high bureaucracy in procurement process is due to PPA 2011 and its regulations 2013. The study recommended that the government should allocate sufficient fund in time when requested to facilitate procurement activities in the organization. In addition, the initiated procurement policies should be customized to relate to the nature of procurement. Lastly, the organization should facilitate smooth compliance, efficient evaluation to obtain reliable supplier as well as provide regular training to the organizational staffs to increase competency and to have skilled staffs that would add value towards organizational procurement performance.