Abstract: Using Al 3+ as sedimentationagent,the technological conditionof extracting Tea -polyphenols was stud-ied.The result showed that the optim al range of pH was from 5.3～5.7and the sedimentation rate was 92.22%～95.28%.The regressionequationof x(mol)(volume of0.1mol /LAlCl 3 .6H 2 O)and y (%)(TPsedimentationrate)was y =17.768+64.657x(r =0.9148).Ftest demonstrated that the regression equation was remarkable at the l evel ofα=0.05.UsingacidsolutionwithpH1.5todissolveTP -Al 3+ (ratiobetweenexperimentalsolutio nandacidsolution was 1∶2),the mixture of acidsolution and TP -Al 3+ was soakedinthe water(50℃)in15minutes.The result showed that the dissolved rate of TPwas 79.09%and that it was the optimal dissolv ed condition.

Key words: A3+ sedimentation method , Tea -polyphen ols , Technology