  This is the second paper in a series studying the star formation rates,
stellar components, metallicities, and star formation histories and evolution
of a sample of blue compact galaxies. We analyzed spectral properties of 97
blue compact galaxies, obtained with the Beijing Astronomical Observatory
(China) 2.16 m telescope, with spectral range 3580\AA -- 7400\AA. We classify
the spectra according to their emission lines: 13 of the total 97 BCGs sample
are non-emission line galaxies (non-ELGs); 10 have AGN-like emission (AGNs),
and 74 of them are star-forming galaxies (SFGs). Emission line fluxes and
equivalent widths, continuum fluxes, the 4000 \AA Balmer break index and
equivalent widths of absorption lines are measured from the spectra.
  We investigate the emission line trends in the integrated spectra of the
star-forming galaxies in our sample, and find that: 1) The equivalent widths of
emission lines are correlated with the galaxy absolute blue magnitude $M_B$;
lower luminosity systems tend to have larger equivalent widths. 2) The
equivalent width ratio [NII]6583/H$\alpha$ is anti-correlated with equivalent
width H$\alpha$; a relationship is given that can be used to remove the [NII]
contribution from blended H$\alpha$ + [NII]6548, 6583. 3) The [OII], H$\beta$,
H$\gamma$ and H$\alpha$ fluxes are correlated; those can be used as star
formation tracers in the blue. 4) The metallicity indices show trends with
galaxy absolute magnitude and attenuation by dust; faint, low-mass BCGs have
lower metallicity and color excess.
