Abstract: The change of moisture content has a great influence on soil properties in practical engineering. In order to determine the influence of water content on mechanical properties of eco-bag reinforced soil and parameters of Duncan-Zhang Model,eco-bag reinforced soil with different water content is taken as the research object. The variation of Duncan-Zhang Model parameters with water content of eco-bag reinforced soil is studied by the triaxial compression test. The experimental results are as follows. Firstly,the stress-strain relationship curves of eco-bag reinforced soil under different water contents show hyperbolic characteristics. Deviational stress with axial strain of 15% is selected as failure strength value for the test. It is found that the failure strength decreases with the increase in water contents. Secondly,the variation of water content has different degrees of the influence on the parameters of Duncan-Zhang Model. With the increase in water contents,the cohesion decreases in a quadratic function relation,and the internal friction Angle,K value and n value all decrease in a linear relation. The failure ratio ranges from 0.828 to 0.990. Thirdly,the initial tangent modulus reflects the resistance of soil to deformation at the initial stage of the stress-strain relationship curve. And the initial tangent modulus of eco-bag reinforced soil decreases with the increase in water contents.At the same time,the empirical formula of initial tangent modulus with water content is obtained.Fourthly,the applicability of the research results is found by analyzing the sample size effect. These conclusions provide a theoretical basis and parameter support for the design and numerical simulation of ecological bag slope protection engineering.