  The tidal properties of a neutron star are measurable in the gravitational
waves emitted from inspiraling binary neutron stars, and they have been used to
constrain the neutron star equation of state. In the same spirit, we study the
dimensionless tidal deformability of dark matter admixed neutron stars. The
tidal Love number is computed in a two-fluid framework. The dimensionless tidal
Love number and dimensionless tidal deformability are computed for dark matter
admixed stars with the dark matter modelled as ideal Fermi gas or
self-interactive bosons. The dimensionless tidal deformability shows a sharp
change from being similar to that of a pure normal matter star to that of a
pure dark matter star, within a narrow range of intermediate dark matter mass
fraction. Based on this result, we illustrate an approach to study the dark
matter parameters through the tidal properties of massive compact stars, making
use of the self-similarity of the dimensionless tidal deformability-mass
relations when the dark matter mass fraction is high.
