  Context. Quasars are spatially stationary, and they are essential objects in
astrometry when defining reference frames. However, the census of quasars is
far from complete. Mid-infared colors can be used to find quasar candidates
because AGNs show a peculiar appearance in mid-infrared color, but these
methods are incapable of separating quasars from AGNs. Aims. The aim of our
study is to use astrometric and mid-infrared methods to select quasars and get
a reliable quasar candidates catalog. Methods. We used a near-zero proper
motion criterion in conjuction with WISE (all-sky Wide-field Infrared Survey
Explorer) [W1-W2] color to select quasar candidates. The [W1-W2] color
criterion is defined by the linear boundary of two samples: LAMOST DR5 quasars,
which serve as the quasar sample, and LAMOST DR5 stars and galaxies, which
serve as the non-quasar sample. The contamination and completeness are
evaluated. Results. We present a catalog of 662 753 quasar candidates, with a
completeness of about 75% and a reliability of 77.2%.
