Abstract:  of Chemistry and Chemical Engineering，Xianyang Normal University，Xianyang 712000，China） Abstract：Cu-Mg-Al hydrotalcite-like compound was prepared by liquid phase co-precipitation method，and intercalating modification was also made by ion exchange method with lauric acid as the modifier.The composition， structure and morphol- ogy of hydrotalcite-like compound before and after the modification were characterized and analyzed by infrared spectrometer. Results showed that the product was Cu-Mg-Al-CO3 hydrotalcite and the modified product was Cu-Mg-Al-lauric hydrotal- cite.The modified and un-modified hydrotalcite were added in a proportion of 3%（mass fraction） respectively to the base for- mulation to prepare a friction lining materials.The law of friction coefficient of those prepared friction lining materials changed with temperature was tested by XD-MSM constant speed friction tester.The density of friction lining materials was also tested by hydrostatic densitometer.Results showed that un-modified hydrotalcite adding into the friction lining materials could reduce the friction coefficient，however，the modified one could increase the friction coefficient due to the expansion of particle size；and the modified one could also reduce the density of friction lining materials.

Key words: hydrotalcite-like compound, intercalating modification, friction factor, lauric acid