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Abstract. It is particularly important to study the rheological properties and rheological behavior of liquid-phase paddy soil for improving the working efficiency of power machinery in paddy field. In this research, a rotational rheometer was used to record the shear stress, shear rate and apparent viscosity of the soil during the test. Additionally, a numerical model was established to explore the effects of soil clay content, moisture content and settling time on soil rheological properties. Through single factor analysis, the contribution rate of each factor to the change of soil initial apparent viscosity is ranked as moisture content (X₂) > soil clay content (X₁) > settling time (X₃). Subsequently, the variation trends of shear stress and apparent viscosity at different shear rates were explored. The change trend of soil rheological behavior is mainly related to soil texture, which silty loam is thixotropic and clay loam is gelatinous. The prediction models for initial apparent viscosity were validated and the results showed great agreement. The research evaluates and predicts the rheological behavior of liquid-phase paddy field soil, and provides a reference for the design, development and use of paddy field power machinery.