Abstract: To extract and purify the tea polyphenols from green tea, two-step extraction technology was studied. The optimum extraction process was determined using the single factor and orthogonal experiments. The experimental results show that the first step for microwave-ethanol extraction is optimum, the best conditions for ethanol concentration of 50%, solid-liquid ratio of l: 30, extraction 20min later, with 320W microwave radiation 25s, and then extract at room temperature 60min, repeat the extraction two times, under this optimum conditions, the extraction rate of TP is 21.74%. For the second step, TP is purified by ion precipitation, the optimum conditions for the selection of A13 + + Zn2 +, the mass ratio of precipitant to tea is 3 : 20, precipitation temperature around 25 ℃, TP is separated as quickly as possible when it is precipitated completely. Under the conditions, TP purity can reach 99.50%.