A laptop computer includes a base, a touch screen, a first hinge structure and a second hinge structure. The first hinge structure is pivotally connected with a side of the base. The second hinge structure is pivotally connected with the first hinge structure. The second hinge structure includes a locking part. The locking part detachably fastens to the touch screen. When the locking part fastens to the touch screen and the angle between the touch screen and the base is within 0 degree and a predetermined angle, the second hinge structure rotates relative to the first hinge structure. When the locking part fastens to the touch screen and the angle between the touch screen and the base is larger than the predetermined angle, the first hinge structure and the second hinge structure rotate synchronously relative to the base.