The preparation and purification technology of flavonoids from Ginkgo biloba L.leaves by using D 101 resin was studied.The best absorbing and d esorbing conditions were determined through studying the effect factors of util ization efficiency of D 101 resin.Among this,the velocity of absorbed sol ution is 3 mL/min, pH value of absorbed solution is 8.3, the velocity of desorbed solu t ion is 1.5 mL/min,if it was desorbed by 70% al cohol of 2 bv of the resin bed at room temperature.The results have...