Abstract: The present invention belongs to the field of drug preparation and detection, and particularly discloses a preparation method for a Eucommia ulmoides Oliv. leaf extract. The extract is obtained from Eucommia ulmoides Oliv. leaves (the mixture of the Eucommia ulmoides Oliv. leaves and Eucommia ulmoides Oliv. male flower) by enzymolysis and extraction of ethanol and water, and can effectively solve the problem that the extract is not easy to spray dry (the Eucommia ulmoides Oliv. leaves contain colloidal substances). The pharmacodynamic experiment proves that the Eucommia ulmoides Oliv. leaf extract has good effect of protecting the health of the renal function. The present invention also develops a detection method for the extract, which not only realizes the quality control of the extract, but also has the advantages of good repeatability and stability.

Abstract: A traditional Chinese medicine compound composition with immune bidirectional regulation effect and its preparation method and applications are disclosed. The traditional Chinese medicine compound composition with immune bidirectional regulation effect is prepared by compounding a volatile oil obtained after heating and refluxing of Schizonepetae herba and an extract jointly extracted by Schizonepetae herba extract residue, Astragali radix and Atractylodes macrocephala in the disclosure. The traditional Chinese medicine compound composition has no side effects and remarkable effect, and the traditional Chinese medicine compound composition disclosed by the disclosure can be used as a dietary supplement or health food raw material to regulate allergic reaction and low immunity. The traditional Chinese medicine compound composition disclosed by the disclosure is suitable for promotion and application.