OBJECTIVE To compare the content of the total flavonoids, favonoid aglycones and terpene lactones in six companies' Ginkgo tablet and Ginkgo biloba L. tablet and two companies' Ginkgo biloba extract and Ginkgo biloba L. for evaluation the quality of two preparations; and then analyze the pharmaceutical economics of two preparations. METHODS According to the crossover trial, the total flavonoids of two preparations and raw materials were detected by UV, and the favonoid aglycones and terpene lactones were de...