With rapid changes of the social contexts, the necessity of the lifelong education and reeducation is gradually increasing in our society. The need of distance education is emphasized consequently, and the quality assurance of distance education is regarded as an important issue. The students' distribution of the Open University if various, For example, it is composed of the various students from diverse areas, ages, occupations and the educational backgrounds and so on. Like these factors are important points in acadcmic achievement of students, Then what is important point in the acadcmic achievement of students in Open University? What is the common feature of students who are high on academic achievement? In this work, academic achievement of students by groups for the quality assurance of distance institution was analyzed. In results, the basic information of efficient studying plans by group was discussed in detail.

academic achievement, distance education, quality assurance, studying continuation, grades, cross-tab analysis