Abstract: The extraction process of tannin from Cinnamon was studied with the methods of solvent extraction and ultrasonic-assisted extraction. Using the quantitative analysis of tannin from Cinnamon with catechin as the standard and vanillin-sulfuric acid as chromogenic reagent to tracking tannin content in extraction process.The results showed that the absorbance had good linear relationship with the concentration of catechin in the range of 0.05~0.30mg/mL, the regression equation was Y=3.0153X+0.0050. The optimal solvent extraction conditions were solvent of 60% ethanol, the ratio of material to solvent at 1∶30g/mL, extraction time of 150 min, and temperature at 70℃, the extraction yield of tannin was 42.35mg/g. The optimal Ultrasonic-Assisted extraction conditions were solvent of 50% ethanol, the ratio of material to solvent at 1 ∶20g/mL, the ultrasonic power at 360 W, extraction time of 40 min, and temperature at 40℃, the extraction yield of tannin was 41.28mg/g.Compared with the solvent extraction, the ultrasound-assisted extraction significantly decreased the dosage of solvent consumption, reduced the extraction temperature and had shorten the extraction time.