Objective To analyses the causes of functional constipation in the old patient and probe into the nursal methods of functional constipation. Method To analyses the causes and explore nursal methods of functional constipation in the 78 old patient without colic and rectal disease. Results The causes of constipation include diet(25.64%), drug(19.23%),custom of excretion(23.08%) and poor exercise(26.92%) as well.After specific nurse 58.97% patients improve and 15.38% patients become normal. Conclusion Gaving specific nurse and guidance to functional constipation patients with specific causes can induce into good effect.