Owing to the decrease of the population of 18 year-old from the late of 1990s in Japan, around the half of private universities are short of their quotas. Such universities are called "Border-Free Universities", which do not have the obstacles to enter and are accepting applications for admission on the recommendation systems. In this article, the significance and the problems of student surveys at "Border-Free Universities" will be discussed. Firstly, the problems of current student surveys are examined. Secondly the characteristics of the students of "Border-Free Universities" are clarified using the survey results of universities in the west of Japan in 2008. Finally, from the examination above, three topics are discussed. 1) Universities in Japan are stratified and classified in a few types. "Border-Free Universities" are completely different from other types, so that the unique research frameworks to examine such universities. 2) The activities of each university affect the student behaviors, so the difference of each university should be examined. 3) To clarify the relationship between the activities of each university and student behaviors, fieldwork and other qualitative methods are required in the research at "Border-Free Universities".