This paper introduces the research of the compatibility between NICALON fiber and aluminum al1oy，pure aluminum，Al-l%Si alloy. The SiO₂+Al layer is plated on the NICALON fiber surface by physical vapor plating and ion plating. After heated in vacuum，the SiC fiber is extrated. The tensile strengh of the fiber is tested. The SiO₂ plating and the Al-l%Si alloy proves to have a little benefit for preventing the SiC fiber from degradation.