  Primordial black hole (PBH), which can be naturally produced in the early
universe, remains a promising dark matter candidate . It can merge with a
supermassive black hole (SMBH) in the center of a galaxy and generate
gravitational wave (GW) signals in the favored frequency region of LISA-like
experiments. In this work, we initiate the study on the event rate calculation
for such extreme mass ratio inspirals (EMRI). Including the sensitivities of
various proposed GW detectors, we find that such experiments offer a novel and
outstanding tool to test the scenario where PBH constitutes (fraction of) dark
matter. The PBH energy density fraction of DM ($f_\text{PBH}$) could
potentially be explored as small as $10^{-3} \sim 10^{-4}$. Further, LISA has
the capability to search for PBH mass upto $10^{-2} \sim 10^{-1} M_\odot$.
Other proposed GW experiments can probe lower PBH mass regime.
