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the CONTCAR only gives the last configeration of the relaxation? Is there any way that I can have CONTCAR of each step?

Thank you very much

XDATCAR file contains atomic positions for each ionic step. also you can find them in cartesian coordinates in OUTCAR file...

Thanks. But if I was using direct coordinates before relaxing the system, then XDATCAR will have direct coordinates also. Is there any way to convert XDATCAR to cartesian coordinates? (OUTCAR only gives initial coordinates, not each step, isn't it?)

The OUTCAR file lists the geometry after every ionic relaxation step in cartesian coordinates.

You can use a script to translate XDATCAR into the xyz format ,and the software molden can read it ,and optimisation will be shown you by the fil.
I think is quite direct .