Through years of experiment research and clinical application, Wenxin Granule is proven to treat arrhythmia effectively. According to pharmacological findings, the granule could delay and shorten arrhythmia; as suggested by findings using Patch-clamp whole cell recording method, Gansong extract from Wenxin granule could inhibit ion channel of cardiocyte. As a Chinese medical compound, the granule is favorable for treating functional arrhythmia, or arrhythmia as complications in infective cardiomyopathy of the elderly and children.