You need to tell us your OS: see the request in the posting guide for 
'at a minimum' the result of sessionInfo().
We also need to know what graphics device(s) you are intending to use.
For postscript or PDF, see the article by Paul Murrell and myself in R 
News 2006-2.
Note too that 'Chinese' isn't one language (most OSes have two
separate
ones for 'traditional' and 'simplified') and several encodings
are used
for each of those languages.  Some devices have separate 'Chinese Fonts'
for the two languages.
On Wed, 12 Mar 2008, Samuel wrote:
> Hi everyone,
>
> I plotted a chart this morning, which should have Chinese lables for the
> points. I made the chart via:
> coordinates:
> angel77wq        360.61501    9.278135
> cngdsthuang1220 -278.74068   91.556843
> c????c       125.47369  -66.589461
> fszym2007       -174.86150  346.672588
> john_azyb_lee    -59.76965  -13.806237
> limu0089        -135.18684 -147.573071
> new??         -147.53176 -130.237810
> ouyangye1215     103.64392 -154.077046
> poleland          20.42025 -190.509781
> ????        -324.70414  300.982933
> ????           6.99539 -102.055952
> ????         674.25244  106.671916
> ????        -282.92130  -38.153908
> ??????    -115.72405 -263.611178
> ??????    -165.43261 -174.308852
> ??????    -224.57776  332.793277
> ?????       139.53463   93.483387
> ??????     -77.28240 -301.935448
> ????         627.93457  125.001091
> ????         -72.13721  176.418576
>
> label:
> [1] "angel77wq"       "cngdsthuang1220"
"c????c"      "fszym2007"
> [5] "john_azyb_lee"   "limu0089"       
"new??"         "ouyangye1215"
> [9] "poleland"        "????"        "????"   
"????"
> [13] "????"        "??????"    "??????"   
"??????"
> [17] "?????"      "??????"    "????"       
"????"
>
> plot(coordinates,type='n')
> text(coordinates,labels)
>
> and then I got the chart looks like the attached one.
No attachment appeared -- see the posting guide for details of what might 
be accepted.
> I know should be the encoding problem,but I don't know where I can
change
> it.
>
> any ideas on this will be greatly appreciated.
>
> Thanks in advance.
>
>
>
> -- 
> Samuel Wu
> http://webclipping.com.cn
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595