Abstract: According to the characteristics of large-scale cluster explicit FEM parallel process for dynamics problem, this paper proposes an improved automatic partition method modified multilevel recursive spectral bisection (MMRSB) based on the optimization to the multilevel recursive spectral bisection (MRSB) method through experiments and analysis. This approach patches some deficit of the MRSB method and develops several partitioning strategies and algorithms in the phases of partitioning process. The paper also adopts MMRSB algorithm to code partition program and applied for different geometry styles. The MMRSB program can provide better partitions than MRSB method, and proves its high efficiency.