Abstract: Two-wave coupling and four-wave mixing phase conjugation properties of Ce-doped KNSBN crystal are investigated at 632.8nm as the temperature increases from 30℃ to 95℃.Two-wave coupling experiment shows that both two-beam coupling gain coefficient Γ and the response speed of the crystal can be enhanced by several times when the temperature is elevated to 95℃.The four-wave mixing phase conjugation reflectivity increases from 4% to 14% in this temperature range.