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Objective:Mitochondrial oxidative stress has been implicated in hypertensive cardiomyopathy.Abnormal Ca2+ handling is thought to be related with triggered activity and mitochondria participate in Ca2+ homeostasis.Astragaloside Ⅳ (ASI) is reported to increase the scavenging of reactive oxygen species (ROS) and nitric oxide(NO) production.We evaluated the contribution of ASI for mitochondrial ROS and Ca2+ Flux to cardiac function by using DOCA-salt hypertensive mice.