A　volume　holographic　grating　lens　can　reconstruct　the　three-dimensional　information　by　collecting　multiple　optical　slicing　of　an　object　according　to　Bragg　selectivity　of　the　volume　holographic　grating.　Its　imaging　resolution　was　analyzed　by　using　the　point　spread　function　of　volume　holographic　imaging　system.　The　volume　holographic　gratings　were　recorded　by　using　two　mutually　coherent　beams　of　a　spherical　reference　beam　(SR)　and　a　planar　reference　beam　(PR),　and　were　used　as　volume　holographic　imaging　lenses　in　the　imaging　system.　The　longitudinal　and　lateral　defocusing　characteristics　of　volume　holographic　lenses　with　SR　beam　and　with　PR　beam　were　investigated　experimentally　by　displacing　the　interested　objects　away　from　original　reference　location,　respectively.　The　effects　of　the　parameters　of　the　volume　holographic　lens　on　the　longitudinal　and　lateral　resolution　were　also　discussed.　The　experimental　results　show　that　bigger　size　of　the　volume　holographic　lens　can　obtain　better　depth　resolution,　and　thus　the　results　of　imaging　are　better.　Since　the　imaging　resolution　of　SR　volume　holographic　lens　is　better　than　that　of　PR　one,　it　is　the　better　choice　to　adopt　a　volume　holographic　imaging　system　with　SR　lens　for　microstructure　imaging.