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Main subject of a school is students. This environment helps them acquire good knowledge and education to form their personalities. Consequently, school management board and parents desire the school must be safe for all the students. Nowadays, the economy is growing while education socialization is impulsed powerfully. Schools are built spaciously and nicely and equipped with full of modern and valuable teaching aids. Thus, the schools are one of the preys for thieves and the students may be kidnapped. Some students of high schools and vocational schools, due to bad impacts of movie, game, love or other social issues, tend to do illegal acts such as fighting, disturbance, revenge or stealing resulting in bad influence on study environment. Beside teaching, school management board and teachers cannot shoulder the above tasks, especially keeping the security. This service requires professional guards who are responsible for maintaining the safety of teachers, students and teaching aids...