This paper makes a survey on the subjects of undergraduates changing majors in Sichuan Agricultural University who entered the university respectively in 2009, 2010 and 2011 and comes to a basic conclusion on the learning and life condition of students changing majors, that is, good overall adaptation yet low excellence rate; difficulty in taking a course and too heavy pressure in learning; relatively too disperse accommodation and bad sense of belonging in class; a series of problems in unblocked information acquisition, especially prominent problems existing in students who change majors in different campuses.