Both the knowledge management system (KMS) and decision support system (DSS) had a wide range research's domain. KMS in technology implementation called knowledge-based system (KBS) as a system that processing and representing the knowledge in the understandable form. When the purpose of the KBS development is a problem-solving or decision-making, then the functionality of the decision support system can be adopted. The KBS that had been developed in the context of decision support considered as knowledge-based decision support system (KBDSS). The challenge is that there no recognition towards the trend summary of the KBDSS within this past five years. In order to identify the trend of the KBDSS, this paper aimed to review the existing KBS development in the decision support context. The result of this review is the dominant research area, the common issues summary and the particular approaches as a contribution with their benefit in each selected papers.