E-procurement as a form of e-governement has been applied in many developed countries. Indonesia as a developing country has implemented an e-procurement system as one that aims to eliminate the corruption that can occur in the procurement process. Surabaya is the second largest city in Indonesia that have implemented e-procurement and became a pilot in another department. Information System (IS) Success Model was used to analyze the success of e-procurement system. The six dimensions of IS Success Model, Information Quality, System Quality, Service Quality, Intention To Use, User Satisfaction, and Net Benefit into variables in analyzing the success of the system. Structural Equation Model (SEM) was used to measure the variables on IS Success Model which can not be measured directly. In the form of a questionnaire survey carried directly to each work unit within Surabaya City Government, entreprises who participated in the auction and also the experts. The findings provide several important implications for eGovernment research and practice. This paper concludes by discussing limitations of the study which should be addressed in reference for the Surabaya City Government e-procurement system improvement in the future.