Conceptual modeling of information systems starting from the beginning of this century is a new subject which plays an important role in the quality assurance of the development, acquisition, adaptation, standardization and integration of information systems. This paper expounds the meaning and scope of conceptual modeling of information systems, the types of conceptual modeling techniques and its performance evaluation. It also studies the content and form of conceptual models and its quality assessment, as well as conceptual modeling context to tackle the existing problems and meet the future demand. This paper intends to provide reference for follow-up research on conceptual modeling of information systems.