texdoc tikz
, sec 24.3 Decorating a Complete Path
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.text}
\begin{document}
\begin{tikzpicture}
\draw [help lines] grid (3,2);
\fill [draw=red,fill=red!20,
postaction={decorate,decoration={raise=2pt,text along path,
text=around and around and around and around we go}}]
(0,1) arc (180:-180:1.5cm and 1cm);
\end{tikzpicture}
\end{document}
感谢