The　microsphere　has　great　potential　to　improve　the　resolution　of　the　system.　The　high　frequency　information　of　the　object　can　be　collected　by　the　microsphere　to　enhance　the　imaging　resolution.　However,　the　unavoidable　chromatic　dispersion　exists　in　the　microsphere　incoherence　imaging,　which　reduces　the　image　quality.　In　this　paper,　the　microsphere　microscopy　system　is　designed　with　the　coherent　light.　The　polystyrene　(PS)　microspheres　with　the　diameter　of　50　mu　m　and　90　mu　m　are　applied,　and　their　refractive　index　is　1.59.　The　object　is　a　transmission　grating　with　a　cycle　of　1.2　mu　m　and　line　spacing　of　600　nm.　The　result　indicates　that　the　grating　can　be　clearly　detected,　and　the　magnification　of　the　microsphere　with　the　diameter　of　50　mu　m　and　90　mu　m　is　2.33　and　1.96　respectively.　Comparing　with　the　traditional　white　light　microscopy,　the　imaging　contrast　has　been　improved　though　the　speckle　noise　is　introduced　for　coherent　light.　Therefore　the　microsphere　has　the　potential　to　improve　the　resolution　of　the　phase-contrast　imaging.