Abdominal fullness was a symptom that often display on elder one. This 94-yearold woman, who had history of hypertension and heart disease, suffered from abdominal fullness for 1 year with hiccup, flatus, dry and bitter mouth, tastelessness in the mouth, etc. Due to the above symptoms and the black hairy tongue, found for one month, she went to the clinic of Gastrointestinal Department at Tri-Service General Hospital for help, and was referred to our clinic. The syndrome differentiation by the TCM was pattern of center burner damp-heat and Ying deficiency with heat. The therapeutic principles were drain dampness turbidity, clean heat and enrich Ying. After treatment, the abdominal distention and black fur improved. From this case report, we discussed the cause, mechanism and principle of the abdominal distention, and the mechanism of abdominal distention with black hairy tongue.