The present invention relates to iRNA such as double stranded RNAs (dsRNA) compositions of targeting Serpinc1 genes, and the method that the method for inhibiting Serpinc1 to express using this kind of iRNA such as dsRNA compositions and treatment suffer from for example haemophiliachemophiliac subject of bleeding disorder.本發明涉及靶向Serpinc1基因的iRNA例如雙鏈核糖核酸(dsRNA)組合物,和使用這類iRNA例如dsRNA組合物來抑制Serpinc1表達的方法以及治療患有出血性障礙例如血友病的受試者的方法。