  It is possible that narrow-line Seyfert 1 galaxies (NLS1s) are in the early
stage of active galactic nuclei (AGNs) evolution. It is important to estimate
the mass of supermassive black hole (SBH) in NLS1s. Here we considered the
different kinds of methods to estimate the SBH masses in NLS1s. The virial mass
from the H$\beta$ linewidth assuming random orbits of broad line regions (BLRs)
is consistent with that from the statured soft X-ray luminosity, which showed
that most of NLS1s are in the super-Eddington accretion state. The mass from
the [O III] linewidth is systematically larger than that from above two
methods. It is necessary to measure he bulge stellar dispersion and/or bulge
luminosity in NLS1s.
