I got the answer just now. Sony gave me a big surprise this time. Because my machine is a japanese verison, after I got it, I modified it to Chinese Menu by....you all knew. But the two options in the 'repeat playback' menu, that is, 'Start(meaning)' and 'Close(meaning)'(all are chinese characters, when I select 'close' when playing, actually the 'repeat icon' however appears on the LCD(it fuctions too, automatically repeat the playing song), on the contrary, when i select ' start', the icon disppears. Faint~~~~Sony totally confused the meaning of the two simple Chinese words, Mr. Smith's hat on Mr. Jacky's head, according to a chinese saying. I don't know the guy from which country do such a translation work. If he is an japanese, too careless, as a common japanese, they should know the meaning of the two simple Chinese words. Even common Korean maybe know. Sony is too careless. ANother thing, you can validate 'start' or 'Close(or stop)' repeat only when the song is playing or paused, but not the case when you stopped the song. I don't think this is a good way since I cannot distinguish very clearly between 'stop' and 'pasue' on MZ-R10, when you press 'ent', they just go the same way, playing from the break point. sorry for a mistake in my own reply above, 'LCD'->'OLED’, hehehehe, so important a thing, cost much money. and thanks richyhu and Ishiyoshi's warm help, although I seldom use it, maybe in the future I will. The important thing is, I found a big translation mistake on RH10. The RH10 certainly can do single track repeat, but for Chinese people, a big headache is waiting for you if you want do it by operating the machine.