  Hybrid neutron stars, the compact objects consisting hadronic matter and
strange quark matter, can be considered as the probes for the scalar tensor
gravity. In this work, we explore the scalarization of hybrid neutron stars in
the scalar tensor gravity. For the hadronic phase, we apply a piecewise
polytropic equation of state constrained by the observational data of GW170817
and the data of six low-mass X-ray binaries with thermonuclear burst or the
symmetry energy of the nuclear interaction. In addition, to describe the
strange quark matter inside the hybrid neutron star, different MIT bag models
are employed. We study the effects of the value of bag constant, the mass of s
quark, the perturbative quantum chromodynamics correction parameter, and the
density jump at the surface of quark-hadronic phase transition on the
scalarization of hybrid neutron stars. Our results confirm that the
scalarization is more sensitive to the value of bag constant, the mass of s
quark, and the density jump compared to the perturbative quantum chromodynamics
correction parameter.
