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I learn that when computer starts it is in real mode.
And kernel is responsible for switching mode from real to protected.
Ok , my question is Grub boot loader runs in real mode or in protected mode ?
AFAIK, Grub starts in real mode like any other software loaded at boot. It switches to protected mode for its run time (detecting HD, displaying menus etc.) and switches back into real mode before loading and running OS such as Linux that do not support multiboot protocol.