微软官网上Paragraph中有：

Public property SpaceAfter Returns or sets the amount of spacing (in points) after the specified paragraph or text column.

Public property SpaceAfterAuto Determines if Microsoft Word automatically sets the amount of spacing after the specified paragraphs.

Public property SpaceBefore Returns or sets the spacing (in points) before the specified paragraphs.

Public property SpaceBeforeAuto Determines if Microsoft Word automatically sets the amount of spacing before the specified paragraphs.

实际设置时，直接设置SpaceAfter能成功，但设置SpaceBefore却不成功。搜了一下，没有相关的问题。

仔细看看了API，Paragraph有属性Format， 即ParagraphFormat接口。其中有属性：

Public property SpaceAfter Returns or sets the amount of spacing (in points) after the specified paragraph. (Inherited from _ParagraphFormat.)

Public property SpaceAfterAuto True if Microsoft Word automatically sets the amount of spacing after the specified paragraphs. (Inherited from _ParagraphFormat.)

Public property SpaceBefore Returns or sets the spacing (in points) before the specified paragraphs. (Inherited from _ParagraphFormat.)

Public property SpaceBeforeAuto True if Microsoft Word automatically sets the amount of spacing before the specified paragraphs. (Inherited from _ParagraphFormat.)

描述基本是一样的。

运行代码：

paraInstance.Format.SpaceBefore = 24;

但运行此代码就能设置成功。 汗死 ms!!