自己在sas的帮助里找一下就有了。
Modified List Input
List input is more versatile when you use format modifiers. The format modifiers are as follows:

Format Modifier Purpose
& reads character values that contain embedded blanks.
: reads data values that need the additional instructions that informats can provide but that are not aligned in columns. **
~ reads delimiters within quoted character values as characters and retains the quotation marks.
** Use formatted input and pointer controls to quickly read data values that are aligned in columns.

通俗的来说是读取不标准的data值和长度大于8字符的字符值，但是字符值中不能内含空格~这是一个modifier list input

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3# yuanqiu8866
好像是可以包含空格的，我文件name是2单词的也可以正常读取