  This study presents a comprehensive analysis of the spectral properties of
886 pulsars across a wide frequency range from 20MHz to 343.5GHz, including a
total of 86 millisecond pulsars. The majority of the pulsars exhibit power-law
behavior in their spectra, although some exceptions are observed. Five
different spectral models, namely simple power-law, broken power-law,
low-frequency turn-over, high-frequency cut-off, and double turn-over, were
employed to explore the spectral behaviors. The average spectral index for
pulsars modeled with a simple power-law is found to be -1.64 +/-0.80,
consistent with previous studies. Additionally, significant correlations
between the spectral index and characteristic parameters are observed
particularly in millisecond pulsars, while no strong correlation is observed in
normal pulsars. Different models show variations in the most influential
characteristic parameters associated with the spectral index, indicating
diverse dominant radiation mechanisms in millisecond pulsars.Finally, this
study identifies 22 pulsars of the Gigahertz-peaked Spectra (GPS) type for the
first time based on the Akaike information criterion.
