A six-piece optical lens system includes, in order from the object side to the image side: a stop, a first lens element with a positive refractive power has a convex object-side surface; a second lens element with a negative refractive power has a convex object-side surface; a third lens element with a positive refractive power has a concave image-side surface; a fourth lens element with a negative refractive power has a concave image-side surface; a fifth lens element with a positive refractive power has a convex object-side surface; a sixth lens element with a negative refractive power has a concave object-side surface, and at least one of object-side and image-side surfaces of each lens element is aspheric. Thereby, such a system can be applied to a high resolution mobile phone.