Abstract: Concentrating test of green tea extractive liquor was carried out using nanofiltration membrane process. The results showed that the membrane permeation flux varied with the property of extractive liquor and rose with the operating pressure and temperature increasing and lowered with concentrating time lasting, the cut-off rate of the main compounds rose with the operating pressure increasing and lowered evidently with the operating temperature increasing and concentrating time lasting. Improvement of operating condition and enhancement of pretreatment of green tea extractive liquor can ensure that the nanofiltration membrane concentrates green tea extractive liquor effectively.