In today"s business portal is very important for information sharing and service delivery in every enterprise. Portal has the potential to develop the performance of an organization in terms of productivity and business process efficiency. Portal is never ended project and need modification time to time as for the business requirements. However implementing portals can make negative significant changes to business environment. Therefore significant information and resources are needed to invest for the success of portal implementation. In this paper we have identified and analyzed some critical success factors in the implementing portals and the results are compared with the results of the other researchers in the same area. The work done in this paper has been taken from both theoretical and practical framework to cover the service delivery as well as the overall portal implementation.