Abstract: From the point of view of the reliablity in engineering applications. This paper devotes itself to the study of adaptive structural synthesis problems and presents an adaptive structural synthesis method (ASSM)as well as a series of technical ways for the implementation. Various typical structures have been optimized to illustrate the power of this algorithm. The results of computations have shown that ASSM algorithm is considerable efficient and has good adaptability,only 5-6 analyses are needed to achieve or access the optimal design even through the test problems are fairly complex. This shows the advantages of adaptive method and the good conditions fur general applications of structural synthesis in engineering design.