Abstract: The thixotropy of soft clay is of great significance for engineering design and construction. In order to analyze the thixotropy of soft clay in Tianjin area,this paper studies the influence of water content,mineral powder content and pH value on the strength and thixotropic strength ratio of the cross plate based on the orthogonal experiment. The test results show that water content,mineral powder content and pH value are the primary and secondary factors affecting the thixotropic strength ratio of Tianjin soft clay. The thixotropic strength ratio of soft clay increases exponentially with the increase of water content, decreases almost linearly with the increase of mineral powder content, and increases with the increase of pH value. But the increasing range gradually decreases. Alkaline is more conducive to the recovery of soft clay strength than acidic environment. By means of regression analysis,a prediction formula for the thixotropic strength ratio of Tianjin soft clay is established. The formula includes water content,mineral powder content and pH value,and predicts the thixotropic strength. The prediction results are better. The research results can provide theoretical reference for engineering practice.