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For the difficulty of applying classical fracture criteria to the actual hydraulic engineering and silulating the process of cracking by conditional FEM, the XFEM is introduced into the analysis of the seepage field in hydraulic structures in this paper. Firstly, analyze the enriched forms of nodes in elements intersecting with cracks, and then build the enriched functions, which could either reflect the features of conductivity matrix within cracks, or satisfy the conditions of that osmotic pressure is continuous across the crack. Thus obtain the XFEM approximation form. Finally, combining with the initial conditions and boundary conditions, the discrete equations and workflow of XFEM for solving the seepage field is established. Case study shows that the method is easonable and reliable. In this paper, based on analysis of the properties of hydraulic concrete structure, analysis and monitoring method of the security status of hydraulic concrete structure crack under the effect of HM interaction is studied by using extended finite element method (XFEM). Infiltration of the reservoir water will change the distribution of the flow field in structures, thereby causing changes of its stress field, displacement field and the crack behavior. Conversely, the seepage boundary condition in cracks will change by the structural stresses and the geometry fetures of the cracks; thereby affecting the distribution of the permeability and the seepage pressure within cracks, and changing the seepage field of the crack area in structures. Therefore, in order to analyse the crack behavior of hydraulic concrete structures under the

Seepage Analysis of The Structure with Cracks Based on XFEM