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The influence of pH on the thixotropy of pure kaolinite suspension and magnesium aluminum hydroxide (Mg-Al-MMH)-kaolinite suspension was studied. The results show that the thixotropic type of pure kaolinite suspension was not affected by pH studied in the range of 3.6012.00. The thixotropic type of Mg-Al-MMH-kaolinite suspension with mass ratio (R) value of MMH to kaolinite 0.029 transformed from complex thixotropy into positive thixotropy with increasing of pH in the range of pH 3.83- 12.00, and the type of thixotropy of Mg-AI-MMH-kaolinite suspension with R= 0.129 transformed from positive thixotropy into complex thixotropy with increasing of pH in the range of pH 3.70- 11.96.