E-procurement is a very important system driving supply chain management to be more efficient. Purpose of thisstudy is to understand e-procurement adoption situation in Thailand and analyze critical success factor of e-procurement implementation. Readiness, benefits, barriers and critical success factors of e-procurement adoption in Thailand were analyzed as a starting point. Factor analysis was then applied to indicate the factor affecting the implementation of e-procurement in Thailand. The results showed that most of the companies are ready to use e-procurement in the future. However, some companies do not have idea about the benefits and barriers of e-procurement adoption. It was also found that four main factors affecting the e-procurement adoption are reliability of information technology and supplier performance, user acceptance of e-procurement systems, financial and integration of e-procurement systems, and top management support.