  Changing look active-galatic-nuclei (CL AGNs) can yield considerable insight
into accretion physics as well as the co-evolution of black holes and their
host galaxies. A large sample of these CL AGNs is essential to achieve the
latter goal. We propose an effective method to select CL candidates from
spectroscopic quasar catalogs using the mid-infrared (MIR) variability
information derived from ALL-WISE/NEOWISE data releases. Our primary selection
criteria include both a large amplitude flux variation and a transition of MIR
color from an AGN to a normal galaxy. A pilot spectroscopic follow-up of 7
candidates among about 300 candidates selected from Sloan Digital Sky Survey
low-redshift (z<0.5) AGN sample results in 6 new turn-off CL AGNs. We expect to
obtain hundreds of CL AGNs once full spectroscopic follow-up of the sample is
carried out.
