Abstract: Provided are a composition and method for inhibiting angiotensinogen (AGT) protein expression. Specifically, provided are a composition and method capable of being used for reducing AGT gene expression and treating AGT-related diseases and disorders. Provided are an AGT dsRNA reagent capable of being used for reducing AGT expression in a cell and an object, an AGT antisense polynucleotide reagent, a composition containing the AGT dsRNA reagent, and a composition containing the AGT antisense polynucleotide reagent.