Abstract: With the rapid and booming development of modern distance education,people are becoming more and more concerned about its quality.Therefore,it is a research topic to study how to guarantee the quality of distance education and construct a quality guarantee system which is in accordance with the distance education reality in our country.Modern distance education is fundamentally based on the net,in which the teaching subject and object are separated.Distance education is not only the simple replacement of means of teaching,but also the reform of education ideology,pattern,content and methods.In developing distance education,we should be aware of the factors influencing its quality,and correctly master the principles and methods of distance education assessment.

Key words: distance education, quality assessment, assessment principles methods