KSORD(Keyword Search Over Relational Databases) is an easy and effective way for casual users or Web users to access relational databases. In recent years, much research on KSORD has been done, and many prototypes of KSORD have been developed. However, there are still critical problems on the efficiency and effectiveness of KSORD systems. In this paper, we describe the overview of KSORD research and development, analyze the efficiency and effectiveness problems in existing KSORD systems, and introduce our study on KSORD in terms of efficiency and effectiveness. In the end, we point out the emerging topics worthy of further research in this area.