Abstract: In order to understand the change rule of dogwood fruit content in the process of development and provide the scientific basis of the harvest time.The samples in the development process of dogwood fruits of loganic acid,ursolic acid,tannins,organic acids and polysaccharides were determined.Then using the principal component analysis measurement results.In different growth period,the change of Shanxi dogwood fruits chemical production has a certain regularity.The primary metabolites gradually increased as the development process of dogwood fruits and a variety of secondary metabolites have different trends.After doing the principal component analysis,the study conclude that the primary metabolites is relatively high if harvesting dogwood at the end of October and secondary metabolites is relatively high if harvesting dogwood at the end of September.

Key words: Cornus officinalis, Harvest time, medicinal ingredients, principal component analysis