The explosion caused by explosive and concentrated in the area around the building could have catastrophic effects, causing damage and destruction such as damage to the building frame, walls, doors and windows, and also could cause death and death of residents. Of course, this effect will be more damaging to residential structures, as these structures are designed exclusively against earthquake. The explosion caused by the explosion causes a rapid increase in air pressure, which itself creates a space around an explosive bomb that remains intact in front of this air environment, but the air will be under a new pressure behind it. In this research, the effect of explosion on the building has been investigated. The results of this study indicate that the pressure on the building during the explosion can be several times greater than the pressure from other hazards. Also, the pressure from the explosion disappears at a great rate, so the destruction of the explosion in the part of the building that is in the blast is far more intense and wider than the back of the building.