[Objective] The aim was to screen out the extraction condition of Pinus densiflora polysaccharides and primarily discuss the activity of Pinus densiflora polysaccharides so as provide basis for developing and utilizing Pinus densiflora polysaccharides.[Method] Pinus densiflora polysaccharides were obtained from Pinus densiflora with water extraction and alcohol precipitation method.[Result] The optimum temperature of extracting was water temperature of 90 ℃,extracting time of 4 h and ratio of material and w...