Construction site is a very complex type of service with the presence of many non-fixed components in and around the construction site. The construction site is a potential place for many problems such as property theft, fighting, gambling, alcohol, even prostitution, ... . Security guards in this type must be strong, have good health, withstand frost, have martial arts, and have the ability to control, detect and handle situations quickly and accurately. The honesty of security guards is also put on top.