  The SEDs of 18 GeV FSRQs are collected and compiled from literature, in which
both the jet emission and the accretion disk radiation can be observed, in
order to investigate the correlations among their jet power (P_jet), accretion
disk luminosity (L_disk), and luminosity of broad line region (BLR, L_BLR). On
the basis of the SED fits with the jet radiation and accretion disk radiation
models, we calculate P_jet and L_disk. No correlation between P_jet with either
L_disk or L_BLR is found. With a sub-sample of L_BLR for 13 GeV FSRQs, it is
observed that L_BLR is strongly correlated with their L_disk. We also study the
BLR covering factors of the GeV FSRQs in our sample, averagely which are
smaller than that of the large samples of radio-loud and radio-quiet quasars.
P_jet of some GeV FSRQs is higher than L_disk, but P_jet of all the GeV FSRQs
is lower than the accretion power of black hole (BH), which is estimated by
\dot{M}c^2=L_disk/0.1, indicating that the total accretion power of BH is
sufficient to drive the jets in these sources; however the uncorrelation
between L_disk and P_jet of the GeV FSRQs may suggest that their jets are
launched by the BZ process via extracting the rotational energy of BH. Using
the L_BLR-L_disk relation of the GeV FSRQs, we estimate L_disk of a BL Lac
sample with their L_BLR. A comparison of L_BLR and Eddington ratio
(L_disk/L_Edd) among BL Lacs, very radio-loud NLS1 galaxies, and FSRQs is also
presented. It is found that along with the BL Lac-NLS1-FSRQ sequence L_BLR and
L_disk/L_Edd increase, which may correspond to the change of the accretion disk
structure and the transformation of the dominant mechanism for jet launching.
This is also consistent with the division of their parent populations, i.e.,
low-excitation radio galaxies and high-excitation radio galaxies.
