  We show the dependence of the Bayesian and the N2-derived oxygen abundances
on the N-enrichment history of the star-forming galaxies. We select 531
metal-poor and ~20,000 metal-rich galaxies from the SDSS database for this
study. Their "accurate" O/H abundances are obtained from Te and P-method,
respectively. The discrepancies of the Bayesian and N2-derived abundances from
these two "accurate" abundances show obvious correlations with log(N/O)
abundance ratios.
