The invention relates to a medicament for treating senile constipation, which is prepared from the following raw medicines in proportions by weight: 15-20g of aster, 10-15g of balloonflower, 20-30g of bighead atractylodes rhizome, 10-15g of rhizoma anemarrhenae, 15-20g of broomrape, 6-9g of monkshood and 6-9g of achyranthes. The taking method comprises the following steps of: preparing the raw medicines in proportions by weight, adding water for decocting to prepare decoction, and taking a dose of decoction per day, wherein one course of treatment lasts for 7 days. The preferable formula comprises 18g of aster, 12g of balloonflower, 25g of bighead atractylodes rhizome, 12g of rhizoma anemarrhenae, 18g of broomrape, 8g of monkshood and 8g of achyranthes. The Chinese medicament provided by the invention aims at the pathology of senile constipation, can be used for treating both principal and secondary aspects of the disease, has an obvious treatment effect and does not have toxic side effects.