  We investigated the radio properties of the host galaxy of X-ray flash,
XRF020903, which is the best example for investigating of the off-axis origin
of gamma-ray bursts(GRBs). Dust continuum at 233 GHz and CO are observed using
the Atacama Large millimeter/submillimeter array. The molecular gas mass
derived by applying the metalicity-dependent CO-to-H$_{2}$ conversion factor
matches the global trend along the redshift and stellar mass of the GRB host
galaxies. The estimated gas depletion timescale (pertaining to the potential
critical characteristics of GRB host galaxies) is equivalent to those of GRBs
and super-luminous supernova hosts in the same redshift range. These properties
of the XRF020903 host galaxy observed in radio resemble those of GRB host
galaxies, thereby supporting the identical origin of XRF020903 and GRBs.
