Objective To investigate the effect and mechnism of lentinan(LNT) on learning and memory abilities in rats with Alzheimer's disease(AD). Methods Ten rats were selected randomly as normal control group(normal saline) from 50 healthy Sprague-Dawley(SD) rats;the other 40 rats were assigned into AD model group,from which 30 model rats were randomly selected and divided into three groups:a model group(normal saline),high dose LNT intervention group(LNT-H,50 mg/kg) and low LNT dose intervention group(LNT-L, 10 mg...