Objective:To observe the effect of Yixin Tai on calcineurin signal pathway of rats with chronic heart failure. Methods:50 healthy male Wistar rats were divided averagely into six group:model group,Yixin Tai high dose group,Yixin Tai middle dose group, Yixin Tai low dose group,perindopril group and normal control group with no mold processing. Every morning experimental animal were given drug as following method: normal group were given no drug,Yixin Tai high dose group 10.5g/(kg.d),Yixin Tai middle dose group 5.5g/(kg.d),Yixin Tai low d...