  The $\Xi_{c}\to\Xi$ form factors are investigated in QCD sum rules in this
work. Contributions from up to dim-5 are considered. For completeness, we also
study the two-point correlation function to obtain the pole residue of $\Xi$,
and higher accuracy is achieved. For the three-point correlation function,
since stable Borel regions can not be found, about $10-20\%$ uncertainties are
introduced for the form factors. The obtained form factors are then used to
predict the decay width of $\Xi_{c}\to\Xi e^{+}\nu$, and our result is larger
than the most recent data of the Belle Collaboration, and still consistent with
the current world average and that of Lattice QCD.
