The efficiency of the Jacobi-Davidson method at initial iteration steps is improved by using the Arnoldi decomposition to construct the initial orthogonal subspace.

• 针对Jacobi-Davidson方法在迭代初期效率低下的问题，提出了用Arnoldi分解构造正交子空间作为初始子空间的方案，有效地改善了迭代初期的计算效率。