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dear sir/Madam i want to know some information about using voice in mcu ,i know need a D/A device for this reason, but i dont know how i use mp3 file in ROM,and how transfer this file to D/A you are very kindly to advise me
Actually there is an MP3 player device from Atmel (see AT89C51SND1 http://www.keil.com/dd/chip/3323.htm). There is an low-cost starter kit that contains already a framework. An alternative is to use the C167. On the TU Wien (Vienna) there was a Diploma work based on that. Take a look to http://www.ict.tuwien.ac.at/ (but the web side appears to be down in the moment). Also try Google and search for "MP3 C167".
Using only a 8051 device, I strongly doubt you can ever decode MP3 data fast enough to play them. MP3 playback needs either hardware assistance by a special-purpose chip, or a rather high performance CPU. No 8051 I've heard of comes even close to being powerful enough for that.
See the Atmel AT89C51SND1, mentioned above. It has the MP3 hardware (and more) and an 8051 controller integrated onto a single chip.