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We fit the (quasi-)simultaneous multi-waveband spectral energy distributions(SEDs) for a sample of low-synchrotron-peaked (LSP) blazars with a one-zoneleptonic model. The seed photons that predominantly come from broad line region(BLR) and infrared (IR) molecular torus are considered respectively in externalCompton process. We find that the modeling with IR seed photons issystematically better than that with BLR photons based on a $\chi^2$ test,which suggest that $\gamma$-ray emitting region most possibly stay outside theBLR. The minimum electron Lorentz factor, $\gamma_{\rm min}$, is constrainedfrom the modeling for these LSP blazars with good soft X-ray data (ranges from5 to 160 with a median value of 55), which plays a key role in jet powerestimation. Assuming one-to-one ratio of proton and electron, we find that thejet power for LSP blazars is systematically higher than that of FR II radiogalaxies at given 151 MHz radio luminosity, $L_{\rm 151MHz}$, even though FRIIs are regarded as same as LSP blazars in unification scheme except the jetviewing angle. The possible reason is that there are some $e^{\pm}$ pairs inthe jet of these blazars. If this is the case, we find the number density of$e^{\pm}$ pairs should be several times higher than that of $e^{-}-p$ pairs byassuming the jet power is the same for LSP blazars and FR IIs at given $L_{\rm151MHz}$.

Constraints on minimum electron Lorentz factor and matter content of jets for a sample of bright Fermi blazars