请使用这样一条Sql语句，试试吧！

SELECT

      (case when a.colorder=1 then d.name else '' end)表名,

      a.colorder 字段序号,

      a.name 字段名,

      (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识,

      (case when (SELECT count(*)

      FROM sysobjects

      WHERE (name in

                (SELECT name

               FROM sysindexes

               WHERE (id = a.id) AND (indid in

                         (SELECT indid

                        FROM sysindexkeys

                        WHERE (id = a.id) AND (colid in

                                  (SELECT colid

                                 FROM syscolumns

                                 WHERE (id = a.id) AND (name = a.name))))))) AND

             (xtype = 'PK'))>0 then '√' else '' end) 主键,

      b.name 类型,

      a.length 占用字节数,

      COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,

      isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,

      (case when a.isnullable=1 then '√'else '' end) 允许空,

      isnull(e.text,'') 默认值,

      isnull(g.[value],'') AS 字段说明   

FROM  syscolumns  a left join systypes b

on  a.xtype=b.xusertype

inner join sysobjects d

on a.id=d.id  and  d.xtype='U' and  d.name<>'dtproperties'

left join syscomments e

on a.cdefault=e.id

left join sysproperties g

on a.id=g.id AND a.colid = g.smallid 

order by a.id,a.colorder

http://www.cnblogs.com/tuyile006/archive/2006/09/27/516289.html