I installed duel boot system (windows-10 and redhat-7) in my computer...
as well as windows NTFS partition permanently mounted using /etc/fstab...
sometimes i got read and write permission, otherwise read permission only...

Installed NTFS Package Name = ntfs-3g

what is the reason...?
how to rectify that problem...?

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Do you get write permission in Linux after you have restarted your PC from Windows?

If so, that may indicate that Windows done a file system check and cleared the NTFS "journal". If the NTFS "journal" is "dirty" the NTFS-3g drivers in Linux will do a read-only mount.

From you screenshots it seems that you do have write permission and you would have that by default for the root user account.

Do a file system check on your NTFS partitions in Windows and then try to mount them in Linux. Also make sure you un-mount them properly before shutting Linux down.

Sometimes get write permission after restarted the machine... mostly get read permission only...

I already gave write permission for the root user...
i don't know, how to assign permission by default for the root user account...

if that is true, then it's a good guess that the hard drive is dying.