I got the answer.

If you don't specify the ods output path, your graph files are stored at the place where you start SAS.
For example, your have a sas file "temp.sas" at c:\temp. You click "temp.sas" to start SAS. Then all the graph files are stored at c:\temp.

ODS RTF FILE='c:\program Files\sas\sas 9.1\freq.htm';
Proc Freq data=temp;
Tables x1*x2 / list;
Run;
Proc Means data=temp maxdec=2;
Var x1 x2;
RUN;
ODS RTF CLOSE;
'c:\program Files\sas\sas 9.1   是默认输出路径，你可以指定。
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