A trough floor office overhead, including several block floor body, characterized in that it comprises several blocks around the board body and white floor trunking group golf activities, the activity is a hollow wiring groove flooring floor. The utility model is reasonable around the board body disposed between the wiring activities may trunking floor, raised floor with trunking set in one, not only can reduce the installed floor level, improve the utilization of floor space, but also further enhance the raised floor function, the various lines arranged by trunking to reach anywhere in the office, wiring flexibility, according to national regulatory requirements and can be strong, weak separately isolated and marked with a color or it will separate the wiring groove area, facilitate future secondary cabling and repair and maintenance. Just open additional wiring duct cover plate can be wiring and repair, saving time, effort, expense.