  Using the generic hydrodynamic model of Gamma-Ray Burst (GRB) afterglows, we
calculate the radio afterglow light curves of low luminosity, high luminosity,
failed and standard GRBs in different observational bands of FAST's energy
window. The GRBs are assumed to be located at different distances from us. Our
results rank the detectability of GRBs in descending order as high luminosity,
standard, failed and low luminosity GRBs. We predict that almost all types of
radio afterglows except that of low luminosity GRBs could be observed by the
large radio telescope as long as the domains of time and frequency are
appropriate. It is important to note that FAST can detect relatively weak radio
afterglows at a higher frequency of 2.5 GHz for very high redshift up to z=15
or even more. Radio afterglows of low luminosity GRBs can be detected only
after the completion of the 2nd phase of FAST. FAST is expected to
significantly expand the sample of GRB radio afterglows in the near future.
