An optical image capturing system with four lenses is provided. In order from an object side to an image side, the optical image capturing system includes a first lens, a second lens, a third lens anda fourth lens. The first lens has positive refractive power and the object side thereof may be a convex surface. The second lens and the third lens have refractive power and the object side and the image side thereof may be all aspheric. The fourth lens has negative power and the image side thereof may be a concave surface. The object side and the image side of the fourth lens are aspheric and atleast one surface thereof has one inflection point. When meeting some certain conditions, the optical image capturing system may have outstanding light-gathering ability and an adjustment ability about the optical path in order to elevate the image quality.