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In this manuscript, we study properties of long-term optical variability of alarge sample of 106 SDSS spectroscopically confirmed AGN with double-peakedbroad low-ionization emission lines (double-peaked emitters). The long-termoptical light curves over 8 years are collected from the Catalina Sky SurveysData Release 2. And, the Damped Random Walk (DRW) process is applied todescribe the long-term variability of the double-peaked emitters. Meanwhile,the same DRW process is applied to long-term optical light curves of more than7000 spectroscopically confirmed normal quasars in the SDSS Stripe82 Database.Then, we can find that the DRW process determined rest-frame intrinsicvariability timescales $\ln(\tau/{\rm days})$ are about 5.8 and about 4.8 forthe double-peaked emitters and for the normal quasars, respectively. Thestatistically longer intrinsic variability timescales can be confirmed in thedouble-peaked emitters, after considerations of necessary effects, such as theeffects from different distributions of redshift, BH mass and accretion ratebetween the double-peaked emitters and the normal quasars. Moreover, a radialdependence of accretion rate $\dot{m}_{\rm R}~\propto~R^\beta$ with largervalues of $\beta$ could be an acceptable interpretation of the longer intrinsicvariability timescales in the double-peaked emitters. Therefore, there aredifferent intrinsic properties of emission regions between the double-peakedemitters and the normal quasars. The double-peaked emitters can be well treatedas an unique subclass of AGN.

Properties of long-term optical variability of active galactic nuclei with double-peaked broad low-ionization emission lines