This study explored the effects of behavior addictions(smartphone addiction, gambling addiction, and relationship addiction) on university life adaptation. To this end, this paper collected data from 2nd to 4th-year students at K-University and used 227 data sets for the final analysis. As a result of the study, it was found that the level of smartphone addiction was above medium, relationship addiction was at a medium level, and gambling addiction was relatively low. Furthermore, it was observed that the more severe the smartphone addiction(β=-.131, p<.01), and the gambling addiction (β=-.125, p<.01), the lower the degree of adaptation to university life. Conversely, higher levels of self-efficacy were associated with a higher degree of adjustment to university life(β=.291, p<.001). Based on these results, it suggests that behavior addiction prevention programs, considering the characteristics of each type, should be developed and provided to prevent behavior addiction in university students. Additionally, there is a need for increased and proactive support and interest in adapting to university life.