Abstract: The sensitivity analysis technique is proposed to deal with the large-scale structural problems. The two common sensitivity methods,the adjoint variable method and the semi-analytical method,are employed to meet different problems. Moreover,two measures are also developed to improve the analyzing efficiency,one is to avoid the repeating analysis by using the relations among design variables,and the other is to replace the large sparseness matrix with the small. The finite element program AASA is developed to compare with MSC. NASTRAN,and the result shows that the proposed methods can achieve high accuracy and efficiency.