Based on the algorithm of 2 dimensional FEMOL,with the essential thought of Finite Layer Method(FLM),a new scheme of 3 dimensional semi analytic algorithm is developed in this paper.

• 在平面有限元线法的基础上,结合有限层法的分层离散、层内解析的思想,在三维空间中构造出了系统的半解析算法。