With the rapid development of technology, online instruction has emerged as an alternative mode of teaching and learning, or at least a substantial supplement to traditional teaching. On-line teaching gives us opportunity to open a broader world and disadvantages to online teaching and learning include factors that result from the impersonal nature that is afforded by a class that exists only in cyberspace. This can cause students to feel disconnected from the rest of the students and from the instructor. Without the traditional human to human interaction, the technology can impose a barrier that has an inhibitory effect on the learning process database accesses, is the solution to all of these grand challenges. This paper describes the current situation of the lack of sensation in on-line teaching and it's reasons, suggest that not recognition teaching should be focus in on-line teaching so does sensation teaching and rises countermeasures for the problems.
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