  A solar jet on 2014 July 31, which was accompanied by a GOES C1.3 flare and a
mini-filament eruption at the jet base, was studied by using observations taken
by the New Vacuum Solar Telescope and the Solar Dynamic Observatory. Magnetic
field extrapolation revealed that the jet was confined in a fan-spine magnetic
system that hosts a null point at the height of about 9 Mm from the solar
surface. An inner flare ribbon surrounded by an outer circular ribbon and a
remote ribbon were observed to be associated with the eruption, in which the
inner and remote ribbons respectively located at the footprints of the inner
and outer spines, while the circular one manifested the footprint of the fan
structure. It is interesting that the circular ribbon's west part showed an
interesting round-trip slipping motion, while the inner ribbon and the circular
ribbon's east part displayed a northward slipping motion. Our analysis results
indicate that the slipping motions of the inner and the circular flare ribbons
reflected the slipping magnetic reconnection process in the fan
quasi-separatrix layer, while the remote ribbon was associated with the
magnetic reconnection at the null point. In addition, the filament eruption was
probably triggered by the magnetic cancellation around its south end, which
further drove the slipping reconnection in the fan quasi-separatrix layer and
the reconnection at the null point.
