This paper introduced LI Qinghai’ s experience in treating pericardial effusion. It is difficult to find pericardial effusion by the four examination of traditional Chinese medicine. On the other hand

with the integration of traditional Chinese medicine and western medicine

the help of modern examination to determine the pathological condition

and the four examinations to find out the essence of the disease

the treatment will be more targeted. Pericardial effusion belongs to"thoracic retained fluid（zhiyin） "

whose root cause is qi

yin and yang deficiency and symptom is internal retention of thoracic fluid. Treatment starts from the harmonizing of qi

blood and water. Resorting qi mainly based on the reinforcing of qi and resorting of yin and yang. Purging excessive pathogenic factors mainly based on increase of water excretion and the combination of herbs of warm and cold property. If the patient suffers from excessive heat

the treatment will be clearing heat and increasing water excretion. If the patient suffers from dampness caused by stasis

the treatment will be promoting the circulation of qi and blood and increasing water excretion.