SELECT t.[name] AS 表名,c.[name] AS 字段名,cast(ep.[value]

  as varchar(100)) AS [字段说明]

  FROM sys.tables AS t

  INNER JOIN sys.columns

  AS c ON t.object_id = c.object_id

   LEFT JOIN sys.extended_properties AS ep

  ON ep.major_id = c.object_id AND ep.minor_id = c.column_id WHERE ep.class =1

  AND t.name='TableName'

--快速查看表结构（比较全面的）

SELECT  CASE WHEN col.colorder = 1 THEN obj.name

                  ELSE ''

             END AS 表名,

        col.colorder AS 序号 ,

        col.name AS 列名 ,

        ISNULL(ep.[value], '') AS 列说明 ,

        t.name AS 数据类型 ,

        col.length AS 长度 ,

        ISNULL(COLUMNPROPERTY(col.id, col.name, 'Scale'), 0) AS 小数位数 ,

        CASE WHEN COLUMNPROPERTY(col.id, col.name, 'IsIdentity') = 1 THEN '√'

             ELSE ''

        END AS 标识 ,

        CASE WHEN EXISTS ( SELECT   1

                           FROM     dbo.sysindexes si

                                    INNER JOIN dbo.sysindexkeys sik ON si.id = sik.id

                                                              AND si.indid = sik.indid

                                    INNER JOIN dbo.syscolumns sc ON sc.id = sik.id

                                                              AND sc.colid = sik.colid

                                    INNER JOIN dbo.sysobjects so ON so.name = si.name

                                                              AND so.xtype = 'PK'

                           WHERE    sc.id = col.id

                                    AND sc.colid = col.colid ) THEN '√'

             ELSE ''

        END AS 主键 ,

        CASE WHEN col.isnullable = 1 THEN '√'

             ELSE ''

        END AS 允许空 ,

        ISNULL(comm.text, '') AS 默认值

FROM    dbo.syscolumns col

        LEFT  JOIN dbo.systypes t ON col.xtype = t.xusertype

        inner JOIN dbo.sysobjects obj ON col.id = obj.id

                                         AND obj.xtype = 'U'

                                         AND obj.status >= 0

        LEFT  JOIN dbo.syscomments comm ON col.cdefault = comm.id

        LEFT  JOIN sys.extended_properties ep ON col.id = ep.major_id

                                                      AND col.colid = ep.minor_id

                                                      AND ep.name = 'MS_Description'

        LEFT  JOIN sys.extended_properties epTwo ON obj.id = epTwo.major_id

                                                         AND epTwo.minor_id = 0

                                                         AND epTwo.name = 'MS_Description'

WHERE   obj.name = 'TableName'--表名

ORDER BY col.colorder ;