The invention relates to RNAi agents, e.g., double-stranded RNAi agents, targeting the Serpina1 gene, and methods of using such RNAi agents to inhibit expression of Serpina1 and methods of treating subjects having a Serpina1 associated disease, such as a liver disorder.本發明係有關於RNAi試劑,如雙股RNAi試劑,其目標為絲胺酸蛋白酶抑制因子A1(Serpina 1)基因,及利用此RNAi試劑抑制絲胺酸蛋白酶抑制因子A1表現之方法,以及治療患有絲胺酸蛋白酶抑制因子A1相關疾病,如肝臟疾病,之個體之方法。