Digital　holographic　microscopy　(DHM)　is　proposed　for　the　three-dimensional　(3D)　profile　measurement　of　the　micro-optical　components,　which　is　characterized　by　its　non-invasion,　non-contact,　high-speed,　and　full-wave　field　scheme.　Firstly,　the　configuration　of　lensless　Fourier-transform　DHM　is　designed　and　built.　The　complex　amplitude　of　the　full-wave　field　is　reconstructed　by　a　single　inverse　fast　Fourier　transform　only.　The　phase　aberration　is　corrected　by　the　two-step　phase　subtraction　method,　and　the　unwrapped　phase　information　is　extracted　by　using　the　least-squares　phase-unwrapping　algorithm.　Then　the　profile　information　of　the　sample　can　be　obtained.　In　the　experiments,　the　profile　of　the　micro-lens　arrays　is　measured　by　the　proposed　configuration,　and　the　results　show　that　the　caliber　and　relief　depth　are　1.595　mm　and　2.424　μm　respectively.　These　are　in　good　agreement　with　the　results　given　by　the　white-light　interferometer.　It　demonstrates　that　the　lensless　Fourier-transform　DHM　is　feasible　and　effective　for　the　3D　profile　measurement　of　the　micro-optical　components.