I'm very pleased about your help.
I feel that i got depth to this side and the generous people here.
But i must ask for more information( in shame).

How can i find out "2.Flash(MLC/SLC),3.PCB model,4.LCD" .is there any guide for it.

p.s:
i think LCD is 1.5 inch.But I'm not sure it can be 1.8 either.

Flash= memory chip with 48pins(i.e. SAMSUNG K9.......)normally china use MLC.
PCB model= observe carefully ur player's circuit board. u will see MP....... V.. printed on the board.
LCD= look at the back of the LCD, near the LCD's pins have some pinting.
how to measure LCD size? measure the display area angle to angle.