The present invention provides a light guide plate having a light exit surface, a light incident surface and a bottom surface. In the said light guide plate, the bottom surface is opposite to the light exit surface, and the light incident surface connects the light exit surface and the bottom surface. A plurality of light guide structures are formed on the bottom surface, and each of the light guide structure includes a front mound protruding above the bottom surface, a back mound protruding above the bottom surface and located at the side of the front mound opposite to the light incident surface, and a concave eye-shaped portion caved in from the bottom surface and located between the front mound and the back mound. The concave eye-shaped portion has a first slope surface connected with the front mound and a second slope surface connected with the back mound, wherein the first slope surface and the second slope surface are connected at the bottom of the concave eye-shaped portion so as to form an arc-shaped connection border junction.