Study of kidney deficiency syndrome may utilize the modern molecular biology technique, such as gene chip, representational difference analysis (RDA) and genes sequence analysis, to clone the different genes of kidney deficiency syndrome from single TCM syndrome type of the disease, to investigate the inner connection between the various phenotypes of kidney deficiency syndrome and their genes expression pattern and their function products, then to definite the related genes of kidney deficiency syndrome. The research method may also be used for the study of other TCM syndrome types.