The properties of strange quark stars are studied within the quasi-particle model. Taking into account the chemical equilibrium and charge neutrality, the EOS of $ (2+1) $-flavor quark matter is obtained. We illustrate the parameter spaces with constraints from two aspects: the one is based on the astronomical results of PSR J$ 0740+6620 $ and GW$ 170817 $, and another is based on the constraints proposed from the theoretical study of compact star that the EOS must ensure the tidal deformability $ \varLambda_{ 1.4}=190^{ +390}_{ -120} $ and support a maximum mass above $ 1.97~M_{ \odot} $. It is found that the both types of constraints can not restrict the parameter space of quasi-particle model in a reliable region and thus we conclude that the small compact star cannot be strange quark star.
Categories: hep-ph