Information applied technology has greatly promoted ELT efficiency by means of resources sharing, distributing and optimizing. In order to demonstrate how to construct a highly efficient teaching system, the paper starts with its remarkable characteristics, further to introduce its design principles, puts emphasis on its model design, which include activities analysis, activities design, rules design and steps design, involving software choosing, MVC architecture and so on, bringing forward the understandings of designing principles, such as accessibility, adaptability, affordability, durability, compatibility and reusability.
The user context and formal specification in interactive system design