There are some correlations between the variation of thymus,T、B cells of adaptive immune system, neutrophil, macrophage, NK/NKT cells, Dendritic cells etc of natural immune system and immunosenescence. Immunosenescence mainly associated with the varies of adaptive immune system, therefor, this article will introduce the inordinately varies of the number, surface molecules, cytokines and signal transduction as well as the dysfunction of T and B cell with age. 