An extract of Xanthoceras sorbifolia Bunge, which comprises greater than 50wt%saponin. Extraction of the extract of Xanthoceras sorbifolia Bunge and its usesin manufacturing medicaments for treating urinary incontinence and frequentmicturition caused by senile dementia or bladder degradation, puerile enuresis,mental retardation for children, cerebral aging, middle-aged dementia andsenile dementia, Parkinson’s syndrome. Dosage forms include injection,tablet, capsule, soft capsule, oral solution or dripping pill.