Ther are three methos in calculating the foundation stiffness matrix by puting force on the element whether it is concentrated force or distributed force . in this article the near - distributedand far - concentrated is adopted . some documents show that the proposed method in calculating stiffness matrix is satisfied in solving the displacements and internal forces of plate by elastic theory . the bem as a valuable method has great advantage over precision and discret ; the foundation layered elastic modle has specific physic mean and easy calculatness 在計算地基剛度矩陣時,按施加在單元上的單位荷載是集中力還是均布力有三種計算方法:均布、近均布-遠集中和集中。本文采用近均布-遠集中方法計算。有關資料表明采用這種地基模型計算地基剛度矩陣,所獲板內力和位移結果能很好的符合彈性解答的基本規(guī)律。