Abstract：The finite element (FE) simulation often finds itself difficult to meet the time and accuracy requirements due to the large scales of projects and complexity of rock properties. To fully utilize the potential of FEM，large-scale parallel FEM are investigated on Windows. PC cluster on Windows operating system is built up. The‘Divide and Conquer’strategies are used to parallel the FEM，and locality of storage is implemented. The equations are solved using the parallel preconditioned conjugate gradient method by domain decomposition method. Integrated with the above-mentioned methods，a parallel FE system，ParallelGeoFEM is developed in C++. A 3D FE underground powerhouses model is simulated，and good speedup ratio is obtained. The results show that the parallel FEM based on domain decomposition method can be used to achieve accurate and good geotechnical simulation within a reasonable short time.
