Abstract: The syndrome of heart failure is very numerous and disordered， and there is no clearly distribution of syndrome types. However， although there are different syndromes， they all connected with water dampness. The mechanism of chronic congestive heart failure lies on yang deficiency and water retention， bad water circulation and disturbance to the heart. The water metabolism disorder forms water evil. Water is the key factor throughout the whole mechanism process. So treating from the perspective of water can help and make hard things simple.