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This study purposed to determine the effects of alcohol intake on the injury experiences and mental health (stress perception, PHQ-9) in people aged ?20 years. This study used the raw data from the KNHANES ?-3. The data from 6,122 out of 7,992 respondents were analyzed, with the exception of 1,870 who were under the legal drinking age of 20 years or had missing values (system and user missing values). The sample size has been changed because the user missing values for each variable were treated as missing. The analysis was using an SPSS WIN Program 20.0 Version.As for the amount of alcohol intake in a round, drinking 7-9 glasses was approximately 1.7 times more likely to contribute to injury occurrence than drinking 1-2 glasses (p<.05). The stress perception rate in the group with a round of ?10 glasses was approximately 1.5 times higher (p<.05). As for the correlation between the alcohol intake characteristics and mental health, the stress perception level was negatively correlated with the alcohol intake experiences (r=-.056, p<.01). PHQ-9 was positively correlated with the amount of alcohol intake in a round (r=.056, p<.01), the frequency of heavy drinking (r= 035, p<.05), and recommendation for moderation in drinking (r=.047, p<.01).Alcohol intake had an impact on injury occurrence as well as on mental health (stress perception, PHQ-9). It is necessary to reinforce a good alcohol intake education and prevention program with the purpose of preventing any injury accident from being caused by alcohol intake and promoting mental health.