The study aimed to evaluate the deviant behavior of high school students. Survey data from 126 students of Hanoi city. The research results show that the deviant behavior of high school student manifests at different levels but mainly at the occasional level in which the behavior is performed with more frequency than talking privately, causing disorder during school hours; Profanity, swearing; Fraud during test hours; Being late to school; Using 2-wheel motorcycles with a capacity of over 50cc. In addition, some deviant behaviors lead to serious consequences not only for the students themselves but also for those around them, such as: Drinking alcohol and then driving; Substance use; Using motorbikes and electric scooters without wearing helmets also practiced by a large number of high school students. Male students have higher standard deviation behavior than female students. Educational measures and disciplinary forms for students' deviant behaviors are not appropriate. Therefore, students, families, schools, and society need to work together to be able to manage and adjust academic behavior in high school students, thereby improving the quality of learning and spiritual life for students.