Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

uses
   ComObj;

 procedure TForm1.Button1Click(Sender: TObject);
 const
   // Word Document to open 
  // Dein Word Dokument 
  YourWordDocument = 'c:\test\worddoc.doc';
 var
   BookmarkName, Doc, R: OleVariant;
 begin
   // Start a Word instance 
  // Word Instanz Starten 
  try
     WordApp := CreateOleObject('Word.Application');
   except
     ShowMessage('Could not start MS Word!');
   end;
   // Open your Word document 
  // Dok. offnen 
  WordApp.Documents.Open(YourWordDocument);
   Doc := WordApp.ActiveDocument;

   // name of your bookmark 
  // Name der Textmarke 
  BookmarkName := 'MyBookMark';

   // Check if bookmark exists 
  // Uberprufen, ob Textmarke vorhanden 
  if Doc.Bookmarks.Exists(BookmarkName) then
   begin
     R := Doc.Bookmarks.Item(BookmarkName).Range;
     // Add text at our bookmark 
    // Text bei Textmarke einfugen 
    R.InsertAfter('Text bei Textmarke');
     // You make a text formatting like changing its color 
    // Man kann nun auch den Text formatieren. z.B die Farbe wechseln. 
    R.Font.Color := clRed;
   end;

   // Save your document and quit Word 
  // Dokument Speichern und Word beenden. 
  if not VarIsEmpty(WordApp) then
   begin
     WordApp.DisplayAlerts := 0;
     WordApp.Documents.Item(1).Save;
     WordApp.Quit;
     BookmarkName := Unassigned;
     R := Unassigned;
     WordApp := Unassigned;
   end;
 end;