An optical lens assembly includes an aperture stop, a first lens element to a sixth lens element from an object side toward an image side along an optical axis. The third lens element has an object-side surface with a concave portion in a vicinity of its periphery, and an image-side surface with a convex portion in a vicinity of the optical axis. The fourth lens element has an image-side surface with a convex portion in a vicinity of the optical axis. The fifth lens element positive refractive power has an object-side surface with a convex portion in a vicinity of the optical axis. The sixth lens element has an object-side surface with a convex portion in a vicinity of its periphery. The thickness of lens elements T1, T2, T3, T4, T6 satisfies (T1+T2+T3+T4)/T6≤4.0.