Any problem installing OS Mavericks

I can't find SL - /dev/disk0s2 on disk utility? i just can find my Bootcamp partition, my OSX partition and my recovery disk (Flaskdisk)

I have no idea what you did when you say "my iMac so my iMac having recovery disk now."

If your recovery partition is on a flash disk, it may not help. It should be on the internal disk, otherwise Mavericks will not use it.

On Page 8 in output of diskutil list you have

Reza-Putras-iMac:~ rezaputra$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk0

1: EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 419.0 GB disk0s2

3: Microsoft Basic Data BOOTCAMP 80.8 GB disk0s3

When I referred to disk0s2, I was referring to this line...

2: Apple_HFS Macintosh HD 419.0 GB disk0s2

SL is short for Snow Leopard that is installed on this partition (disk0s2). Bootcamp is partition with "3:".

If you run Disk Utility, you should see something similar to the following

Can you reduce the size of Macintosh HD by 5GB by dragging bottom right corner of partition named "Macintosh HD" upwards towards the top slowly?

If that is possible, then you should have enough to build a recovery partition. If it gives you an error, then Mavericks install is also unable to create a partition for Recovery.

I have reduce the size of macintosh HD from Recovery disk (flashdisk) 10GB but still failed to install maverick. I dont have any idea for this realy...

1. Can you post a screen shot of the your hard disk which has OS X and BOOTCAMP after you enable Disk Utility Debug mode as mentioned here... http://macs.about.com/od/usingyourmac/qt/Enable-Disk-Utilitys-Debug-Menu.htm?

2. Changing your Recovery partition on a Flash disk will not help with Mavericks upgrade for your original internal hard disk which has Snow Leopard.

3. In the Console utility, there should be an install.log which should mention "Install OS X Mavericks"? You can post its contents here, after you have removed all personal information.