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We collect a large sample with a reliable redshift detected by the Fermisatellite after 10 years of data (4FGL-DR2), including blazars, $\gamma$-rayNarrow-line Seyfert 1 galaxies ($\gamma$NLS1s), and radio galaxies. Thespectral energy distributions (SEDs) of these Fermi sources are fitted by usinga second-degree polynomial, and some important parameters including spectralcurvature, synchrotron peak frequency, and peak luminosity are obtained. Basedon those parameters, we discuss the Fermi blazar sequence and the particleacceleration mechanism. Our main results are as follows:(i) By studying therelationship between the synchrotron peak frequency and the synchrotron peakfrequency luminosity, jet kinetic power, and $\gamma$-ray luminosity for jettedAGNs, we find an ``L'' shape in the Fermi blazar sequence. (ii) There is asignificant anti-correlation between Compton dominance, black hole spin, andthe synchrotron peak frequency for jetted AGNs, respectively. These resultssupport that the $\gamma$NLS1s and radio galaxies belong to the Fermi blazarsequence. (iii) On the basis of previous work, statistical or stochasticacceleration mechanisms can be used to explain the relationship betweensynchrotron peak frequency and synchrotron curvature. For different subclasses,the correlation slopes are different, which implies that the Fermi sources ofdifferent subclasses have different acceleration mechanisms. (iv) The FSRQs and$\gamma$NLS1s have a higher median spin of a black hole than BL Lacs and radiogalaxies.

Curvature of the spectral energy distribution, Compton dominance and synchrotron peak frequency in jetted AGNs