A study of the problem of students being late Prachaksinlapakarn School year 2558 and Carmi, the study questionnaire. The objectives: 1) to study the behavior of the high school students, 2) to find solutions to the problem behavior late for school student school Prachaksinlapakarn . 3) to encourage students to follow the rules of the school. strictly The sample used in this study. School is Prachaksinlapakarn School. In the first semester of the academic year, 2559 students from 962 people who show up late.