Now there are many different types

Now there are many different types of instructional media whose performances and features are different, and the performances of the teaching content exist one kind or another limitation, which means that no single media can not be good to face the whole teaching process. As a complete classroom teaching, it is often composed of multiple basic teaching activities. When one kind of media delivery does not meet the requirements, other media can be supplemented. Therefore, it is necessary to optimize teaching and learning media with different performance to avoid weaknesses in
the teaching process, and apply interactively, and harmonize the teaching effectiveness. In a word, according to the need of learner characteristics, teacher characteristics, teaching content and teaching goals, various media combine and exhibit their length, complement and reinforce mutually to constitute a optimized teaching media group for the transmission of teaching information, and various media co-involve the entire process of teaching in order to achieve optimum results.