  Based on a large Fermi blazar sample, the blazar sequence (synchrotron peak
frequency $\nu_{\rm peak}$ versus synchrotron peak luminosity $L_{\rm peak}$)
is revisited. It is found that there is significant anti-correlation between
$\nu_{\rm peak}$ and $L_{\rm peak}$ for blazars. However, after being Doppler
corrected, the anti-correlation disappears. The jet cavity power ($P_{\rm
jet}$) is estimated from extended radio luminosity. So it is free of beaming
effect. We find that there are significant anti-correlations between $P_{\rm
jet}$ and beam-corrected $\nu_{\rm peak}^{'}$ for both blazars and radio
galaxies, which supports the blazar sequence and unification of blazars and
radio galaxies (an alternative relationship is the correlation between jet
power and $\gamma$-ray photon index).
