installed c: win98 d:redhat linux 9.0
delete grub boot loader ...... boot to win98 at once
linux boot disk not make, and linux cd-rom have not..
installed via hard drive, when linux install...

I wanna help you but I really don't understand what's the problem? You deleted GRUB? Is that it? In that case you can boot of the CD, and then type (as root) grub-install /dev/hda at the CLI, and it will reinstall GRUB for you.

after booting by win98 boot disket, run the fdisk/mbr command
can't booting to redhatllinux..
can linux boot without grub boot loader?

so basically you nuked the boot record.... any reason? of course you can boot to linux, just put your boot disk in the drive... you did make a boot disk didn't you?

if you havent,try http://www.bootdisk.com/linux.htm

Is right method of make a linux boot disk on win98 without using a redhat cd?
C:\> d:
D:\> cd \dosutils
D:\dosutils> rawrite
Enter disk image source file name: ..\images\bootdisk.img
Enter target diskette drive: a:
Please insert a formatted diskette into drive A: and
press --ENTER-- : [Enter]
D:\dosutils>

Knoppix is handy to have in this scenario:

http://www.knoppix.org/

Can Linux boot without the GRUB boot loader? Clearly the answer is yes. GRUB is but one of many boot loaders, there's also SYSLINUX. Loadlin, and LILO that are commonly available with many Linux distributions, and there are quite a varietty of other boot loaders that can be used with Linux, too. Even a DOS boot loader can be made to boot a Linux kernel if you supply it with the correct information.

The key question to ask is whether or not you still have a boot block and a boot kernel on the disk partition containing your Linux system. As long as you do, then there are numerous different boot loaders that you can use.

I happen to like the GNU GRUB boot loader best of all, but it's certainly not the only alternative you have available.

Does this help?

Second that, I also tried most of them and GRUB is the one I like best, with LILO a close, close second.

I'd probably use LILO all the time if I didn't get so irritated because I forget to run /sbin/lilo every time I change entries...

Just reinstall Redhat 7.2 today.
I use lilo before,
when grub> prompts up
I don't know what to type to get to my operating system
Can anyone tell me what is the command to load linux after this:

grub>

root (hd0,0) (assuming that you have linux on first partition first disk)
kernel (hd0,0)/boot/yourkernel(probably "vmlinuz"
boot

after booting into your linux system you might want to create a /boot/grub/grub.conf so that you don't have to type all that junk in every single time.

Installing a bootloader
Multiboot with GRUB Mini-HOWTO
Linux+Win9x+Grub HOWTO
KNOPPIX Linux Live CD
Linux Bootable Business Card
Tom's Root and Boot floppy