In view of literature research for student loans mode and students who acquired bachelor degree with low-income family, it summarized researchers' different opinions at the base of theory mode for learning permanence and economic factors, and also proved that student loans have something to do with education effect. Future research should be conducted to focus on student selection bias which including variables (e.g. variables related to students' motivation and aspiration) that play an important role in student degree completion when examining the association between student loans and low-income students' educational achievement.