This article from the information age to the long-distance teaching request, the network and the network teaching characteristic embarked, analyzes has developed on the net the teaching vital significance, it has fully used the Internet shared resource, did not have the region limit, could advance the teaching quality and the speed, and could facilitate everybody the exchange and studies mutually, carries in the net the real-time exchange. Traditional long-distance teaching through way transmission teaching information and so on television, recording tape and letter, information transmission speed slow, information content small, between teachers and students alternately few, is easy to create the teaching efficiency lowly, student’s study enthusiasm is not high, the teaching effect is not good and so on the question. Based in the web net the teaching is the 21st century modern distance learning development direction.