  We study the interface effects of quark-hadron mixed phase in compact stars.
The properties of nuclear matter are obtained based on the
relativistic-mean-field model. For the quark phase, we adopt perturbation model
with running quark masses and coupling constant. At certain choices of
parameter sets, it is found that varying the quark-hadron interface tension
will have sizable effects on the radii ($\Delta R \approx 600$ m) and tidal
deformabilities ($\Delta \Lambda/\Lambda \approx 50\%$) of hybrid stars. These
provide possibilities for us to constrain the quark-hadron interface tension
with future gravitational wave observations as well as the ongoing NICER
mission.
