Due　to　the　limitation　of　traditional　microlens　arrays　(MLAs)　in　integral　imaging　display,　the　depth　of　field　(DOF)　is　restricted　in　space　and　the　center　depth　plane　is　difficult　to　extend　in　a　large　range.　Here,　we　propose　a　microfabrication　method　based　on　bifocal　MLAs　to　improve　DOF.　The　bifocal　MLAs　for　extended　DOF　were　fabricated　by　using　two-step　photolithography　and　thermal　reflow.　This　method　allows　diverse　microlenses　of　high　to　low　numerical　aperture　to　achieve　high　spatial　resolution　as　well　as　accurate　depth　estimation.　Microlenses　of　different　focal　lengths　were　simultaneously　deposited　on　a　substrate　by　repeated　photolithography　with　multiple　photomasks　with　alignment　mark　to　define　micro-posts　of　different　thicknesses.　Hexagonally　packaged　bifocal　MLAs　clearly　show　the　DOF　extended　from　0.004　to　4.908　mm　for　57.6　mu　m　in　lens　diameter,　and　their　corresponding　object　distance　ranges　from　0.125　to　0.165　mm.　Based　on　the　proposed　scheme,　this　method　provides　potential　applications　in　integral　imaging　3D　display　or　light　field　display.