  We revisit the power spectrum analysis of the complete sample of the two
degree field (2dF) QSO redshift (2QZ) survey, as a complementary test of the
work by Outram et al. (2003). A power spectrum consistent with that of the 2QZ
group is obtained. Differently from their approach, fitting of the power
spectrum is investigated incorporating the nonlinear effects, the geometric
distortion and the light-cone effect. It is shown that the QSO power spectrum
is consistent with the $\Lambda$ cold dark matter (CDM) model with the matter
density parameter $\Omega_m=0.2\sim0.5$. Our constraint on the density
parameter is rather weaker than that of the 2QZ group. We also show that the
constraint slightly depends on the equation of state parameter $w$ of the dark
energy. The constraint on $w$ from the QSO power spectrum is demonstrated,
though it is not very tight.
