<p>Using proc import. You need to re-format the data in the created dataset "QingFeng".<br/>Hope this help.</p><p>proc import datafile='D:\MySAS\SASData\d41ch728.txt'<br/>&nbsp;&nbsp;&nbsp;&nbsp; out=qingfeng<br/>&nbsp;&nbsp;&nbsp;&nbsp; dbms=dlm<br/>&nbsp;&nbsp;&nbsp;&nbsp; replace;<br/>&nbsp;&nbsp;&nbsp;&nbsp; delimiter='09'x;&nbsp;&nbsp; <font style="BACKGROUND-COLOR: #ffff00;">/* the&nbsp;data file is tab delimited */<br/></font>&nbsp;&nbsp;&nbsp;&nbsp; datarow=5;<br/>run;</p><p>Here is the log file</p><p><br/>NOTE: The infile 'D:\MySAS\SASData\d41ch728.txt' is:<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; File Name=D:\MySAS\SASData\d41ch728.txt,<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; RECFM=V,LRECL=32767</p><p>NOTE: 21969 records were read from the infile 'D:\MySAS\SASData\d41ch728.txt'.<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The minimum record length was 64.<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The maximum record length was 71.<br/>NOTE: The data set WORK.QINGFENG has 21969 observations and 10 variables.<br/>NOTE: DATA statement used (Total process time):<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; real time&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.10 seconds<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cpu time&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.09 seconds<br/></p>

太感谢楼上的好心人了！
开始我从没想到要用proc import
顺着这个思路搜索了一下，发现还有类似的程序也可以解决
proc import datafile='c:\0\exercise\d41ch728.txt'
     out=d41ch728
     dbms=tab
     replace;
     datarow=2;
run;
有兴趣的同学可以看一下这个网址http://www.ats.ucla.edu/stat/sas/faq/readdelim8.htm

proc import datafile='D:\MySAS\SASData\d41ch728.txt'
     out=qingfeng
     dbms=dlm
     replace;
     delimiter='09'x;   /* the data file is tab delimited */
     datarow=5;
run;

套用这个模式，我第一列原来希望是字符型的，到SAS里全成数值型了，不知道为啥