1 INTRODUCTION
E-learning implies an important learning approach in modem era. It is the key problem for E-learning that how to reuse learning resources and how to organize the kernel logic of courses better. In order to fulfill the needs of learning resources sharing and reusing, many international organizations has planned a serious of influencing international standards including LMS (Learning Management System) by AICC(The Aviation Industry CBT Committee), IMS(Instructional Management Systems) by IMS Global Learning Consortium[2] and the Learning Object by IEEE/LTSC(IEEE's Learning Technology Standards Committee), etc.