Hello , I am using Linuxmint8. I have done some mistake and my /root partition cannot load at booting.Only a console is being appeared for maintenance for root user,Is there any way I can login?

Is it a new install?
Did you have a desktop environment & lost it?

Did you try and type the root password in???
What was the 'mistake' you did before this happened?

Do have made changes in /etc/fstab ?
If yes, just revert it and it will start working. or you can boot your system from LinuxMint CD, take backup and Install Linuxmint again. it is the best way.

I had a Lot of identical problems with "Mint-Ubuntu OS's" early this year...
I always solved that boot-up no-show, by adding Ubuntu-910 to the hd as a secondary install.. It then created a dual-boot which over-rode the bugs that caused that nasty little problem.. That gave me the opportunity to retrieve my files.. but when ever I installed new OS's on those corrupt hd's, the OS's were always troublesome.. until I "DBAN-Autonuked" the hd's, which erased the buggy little partitions that the new installs couldn't...

To me, your problem reads like you got "hacked and jacked by playful black attacks", like I did about 50-times this year.. or somehow you caused the glitch by adding incompatible code or softwares..?

[if you wants to, just fer the heck of it, see a classic example of what installing incompatible software can do to Ubuntu.. just before you run DBAN-autonuke to erase the hd, install "Wine", then install "WinWall".. and watch the huge stormy mess it causes..]

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People just gotta get it that it is crucial you make backups daily in this "bug hurt bug world".. It's easy.. All you do is drop the day's work into a flash just before you switch off.. then when "the bug hits your fan", you never lose any important data... Replacing the OS is the easy part.. Trying to recover seriously lost files is usually impossible... Gone is gone...

P.S.: After I switched to Fedora-14.. all those troubles vanished.. but today someone crashed the software program in the cable modem.. It took only a phone call to the provider to have the tech reload the modem's corrupt software.. Plus I had the provider file an "abuse ticket" into their system for my IP, which now records all the IP's doing abuse activity to my modem through my provider...