A　volume　holographic　grating　lens　can　reconstruct　the　three-dimensional　information　by　conducting　multiple　optical　slicing　of　an　object　based　on　Bragg　selectivity　of　the　volume　holographic　grating.　In　this　paper,　we　employ　the　point-spread　function　of　volume　holographic　imaging　system　to　theoretically　analyze　its　imaging　resolution.　In　the　experiments,　the　volume　holographic　gratings　are　made　with　a　spherical　reference　(SR)　and　a　planar　reference　(PR),　respectively,　and　used　as　volume　holographic　imaging　lens　in　our　imaging　system.　The　longitudinal　and　lateral　defocusing　characteristics　of　volume　holographic　lens　with　SR　and　with　PR　are　investigated　experimentally　by　displacing　the　interested　objects　from　original　reference　location,　respectively.　The　effects　of　the　parameters　of　the　volume　holographic　lens　on　the　longitudinal　and　lateral　resolution　are　also　discussed.　The　experimental　results　show　that　increasing　the　size　of　the　volume　holographic　lens　can　improve　the　depth　resolution,　and　in　particular,　it　has　greater　influence　on　SR　VHI.　The　lateral　selectivity　of　SR　VHI　is　more　sensitive　than　that　of　PR　VHI,　and　the　Bragg　degenerate　diffraction　of　PR　VHI　on　the　y　axis　is　obviously　observed.　2009　SPIE.