An optical lens system for taking image, from object side along the optical axis comprises an aperture stop, a first lens element, a second lens element, and a third lens element. The first lens element is a positive meniscus lens element with its convex surface facing the object side. The second lens element is a negative meniscus lens element with its convex surface facing the image side. The third lens element is a positive meniscus lens element with its convex surface facing the object side. The three lens elements are made of plastic, and both surfaces of each lens element are aspheric. The focal length of the optical lens system is f, the focal lens of the first lens element is f1, the focal length of the second lens system is f2, and they satisfy the relations: 0.7