The utility model relates to a light gauge steel partition wall ground fossil fragments, include the U -shaped section bar main part of compriseing bottom plate and two vertical boards, the both endson U -shaped section bar main part upper portion still are provided with the flank that extends to the outside respectively. But the upper portion knee wall board of flank, foot of a wall department U-shaped section bar bulk phase to the inside concave yield of wallboard, form the indent skirting line of nature, this partition wall root indent skirting line does not need extra adding to establishthe skirting line after the partition wall construction is accomplished, has both guaranteed that the partition wall root did not produce quality problems such as making moist, be out of shape, go mouldy, has improved the whole pleasing to the eye nature of partition wall in addition, is favorable to furniture to be put by the wall paper and lays the circuit along the foot of a wall.