  3C 273 is one of the nearest high-luminosity quasars. Although classified as
a blazar, 3C 273 also has some features in Seyferts, whose X-ray may originate
from the corona. Since both jet and corona produce power-law spectra in X-ray,
the spectrum cannot completely distinguish their contributions to 3C 273 in the
low state. X-ray polarimetric observations provide the chance to constrain the
X-ray radiation origin of 3C 273 in the low state. We perform general
relativistic radiative transfer simulations with the code MONK to compute the
X-ray polarization in 2-10 keV from the jets, sphere coronae, and slab coronae
for 3C 273. We find that the radiation from the jet in 2-10 keV has a larger
polarization degree than that of the corona: the polarization degree in 2-10
keV from the corona is unpolarized, while these are 4.1%-15.8% for the jet with
a vertical or radial magnetic field and $\leq$5.0% for the jet with toroidal
magnetic field. The X-ray polarization of the corona and jet is sensitive to
optical depth and geometry, and the main driver for this dependence is the
number of scatterings. These results show that X-ray polarization can
effectively constrain the X-ray radiation origin of 3C 273 in the low state.
