Modifications of Coomassie brilliant blue (CBB) method for proteins assay were made. The key factors affecting the results of tea liquor protein assay were studied, using bovine serum albumin (BSA) as external standard protein. The results showed that BSA-CBB complex and tea liquor proteins-CBB complex had similar ultra-visible (UV) absorption spectrum, and there were 4 peaks occurred at 205nm, 260nm, 305nm and 590nm, respectively, It also showed that the optimum conditions were 2.5~5.0 ml tea liquor, dyein...