Introduction:
High school students who consume adequate amounts of milk have a lower risk of developing non-communicable diseases, have higher bone density, are better able to absorb nutrients, and have improved academic performance. Milk consumption in Vietnam is still low and ineffective in this area. A problem like this may be explained by factors like knowledge and attitude.

Method:
Cross-sectional description of 590 high school students in Hoang Mai district, Hanoi. The questionnaire consists of 33 questions (general information, knowledge, attitudes, and behaviors of using canned milk) based on referenced questionnaires from previous related studies. The data has been cleaned, processed, and analyzed using Jamovi software, etc. Descriptive statistics are presented by frequency and percentage for qualitative variables. Statistical analysis was performed to find the correlation, determined by the correlation coefficient r and the 95% confidence interval. The correlations were statistically significant when p < 0.05. Assess the knowledge and attitudes of individuals according to 3 levels: Not good (=90%).

Results:
General knowledge about canned milk is at “Not Good” (Mean Score: Male - 69.8%, Female - 68.6%), Attitude is at “Pretty Good” (Mean Score: Male - 76.8%, Female - 78.1%). Grade 12 has lower knowledge and attitudes than other grades (p<0.001). Understanding of nutritional value is better than knowledge of the health benefits of milk. There is a positive correlation between knowledge about nutritional value with milk consumption behavior (r=0.144), attitude towards milk consumption behavior (r=0.233), and knowledge with attitude towards using condensed milk. box of high school students (r=0.411).

Recommendation:
Strengthen educational programs to improve knowledge and attitudes to positively improve the students' behavior using milk-canned milk at this age.