This study aimed at the study of blended learning models and their main aspects and components in order to introduce the application of these models to improve learning and teaching phenomenon with a blended approach in the countries' education system as a new and relatively successful approach in the world. The methodology of the present study was descriptive and data were collected through library research by using various resources including books, magazines and websites. Due to the variety of blended learning models and based on one of the specific common sampling methods in qualitative research, Criterion-based purposive non-probability sampling, four models were selected based on criterions such as the extent of the application, academic records of the designer of the model, attention to various aspects of blended learning, the references to the model in credential scientific resources (ranging from articles and books). In this investigation, the researcher, first, studied these models and then extracted main aspects and components based on the study of various resources and finally, discussed prominent points of each model. The results of this study were identification of main aspects and components of these models and their characteristics.
