High resolution imaging or super resolution imaging is always a hot topic in the field of artificial metamaterials. Since the conventional optical imaging lenses suffer from the so-called diffraction limit, the resolution is limited to half a wavelength. In order to break this restriction, many metamaterial-based superlenses and hyperlenses have been proposed and investigated. In this work, we present a simple high-resolution imaging system, which is composed of a magnifying lens and a planar focusing lens. The all-dielectric metamaterial magnifying lens is a modified hemispherical solid immersion lens (SIL) with impedance-matching layer, which is made of gradient-index materials. The high permittivity materials in the core of the magnifying lens can magnify evanescent waves that carry subwavelength imaging information. The magnified waves will propagate smoothly to the free space by the matching layer outside the core region. The planar focusing lens will gather the imaging information and produce the image. Therefore, the image formed by the focusing lens contains the magnified subwavelength-imaging information. The planar focusing lens is designed by geometry optics and cylindrically symmetrical. In the simulation, two point sources with a distance of less than half a wavelength are embedded in the core of the magnifying lens. Thus, the two point sources are imaged at the focus of the planar focusing lens with enlarged distance. Both of the magnifying lens and planar focusing lens are made of isotropic dielectric metamaterials, hence, such a simple high-resolution imaging system works efficiently in a broad band.