A three-piece optical lens system comprises, in order from the object side to the image side: a first lens element with a positive refractive power having a convex object-side surface, one of the object-side surface and an image-side surface being aspheric; a stop, a second lens element with a positive refractive power having a concave object-side surface, one of the object-side surface and an image-side surface being aspheric; a third lens element with a negative refractive power having a concave image-side surface, one of an object-side surface and the image-side surface being aspheric. A refractive index of the third lens element is N3, an Abbe number of the third lens element is V3, and they satisfy the relations: N3>1.57; V3