Abstract: This paper is to introduce Prof. Wang Zai-fang's clinical experience in treating contractile failure with Yiqi Qiangxin Decoction. Prof. Wang holds that the pathogenesis of this disease is due to the qi deficiency as its root cause and phlegm (dampness) stagnation as the excessive pathogen. It will attack the heart and pertain to the lung， spleen and kidney. Excess occurs during the attacking stage and deficiency becomes worse during the chronic stage. The basic principles for the treatment are reinforcing qi and warming yang as well as activating blood circulation and inducing diuresis. Yiqi Qiangxin Decoction is commonly applied in the clinic with certain modification.