Summary: Based on the properties of \(t\)-structure of a triangulated category, the paper discusses the relationship between the \({K_i}\)-groups of \(t\)-structure of the triangulated category and \({K_i}\)-groups of the triangulated category. Moreover, if \(t\)-structure is stable, it is shown that \({K_i}\)-group of triangulated category is isomorphic to the direct sum of \({K_i}\)-groups of \(t\)-structure.