The purpose of the study was to assess the electronic single window service implementation at Ethiopian custom commission in case of mojo branch office. The aim of paper was to assess the implementation of single window service benefit for government and private sector, through reduction of cost, reduction service delivery time, and effective utilization of resource, reduction of complex transaction and communication gap and for trade facilitation through reducing the corruption in connection with service delivery and to establish the level of ESWS importance around users.rnThe research design was engaged for this study was qualitative and quantitative research method and Data collection methods were used structured questionnaire by using liker t scale methods, interview and observation. Source of data used primary and secondary data that collected from 80 respondents of employees of customs commission mojo branch office particularly those involved in clearance operation and selected stakeholders. Methods of data analysis were used SPSS version and simple excel operation. The major findings of the study were suggested and presented by frequency table and charts. So that, as indicated in the finding of analysis around 54.50% of respondents agree and ensuring that electronic single widow reducing cost of clearing goods at the customs with integrity of other government agencies (OGA) and 46.80%respondents indicating that electronic single window has high service delivery time through communication with customers improved customs and other government agencies (OGA) service without existing physically. And also59.70% of respondents agreed on electronic single window can reduce complexity of transaction redundancy by linking the regulatory and other private companies thus providing competitive environments for government and private regulatory agencies.rnThe study noted that there were some challenges and communication gaps in the implementation process and it recommended that collaboration of stakeholders, support of Government and non-government organization to improving electronic technology capacity building and continues monitoring and evaluation follow up for implementation of ESWS.rnKey words: - SWS, Service sectors, WTO, B2B, WCO.