Objective: To study the change rule of dynamic accumulation of biennial Scutellaria baicalensis growth and development and active component in Chengde regions. Method: Took samples once every fifteen days from 1 May to 15 October 2008 and recorded the phenophase. Using high performance liquid chromatographic method to measure the content of baicalin

baicalein and wogonin

and using ultraviolet spectrophotometry to measure its flavonoids content. Result: The general growth rule of aerial parts of biennial S. baicalensis in Chengde regions was slow-fast-slow. Which was in vegetative growth two times. The general growth rule of root was fast-slow-fast

which had highest drying rate on 55.31%. The changes of content of baicalin and flavonoids were similar

which the highest content was at middle May

and the data were 17.61%and 42.92%. The changes of content of baicalein and wogonin were similar

which the highest content was at at June

and the data were 2.63% and 0.49%. Conclusion: The highest content of baicalin and flavonoids in biennial S. baicalensis which was grown in Chengde regions was at middle May. The highest content of wogonin and flavonoids was at June. The highest drying rate was in early and middle October.