In 1980, the topology of the band structure of matter was formulated and a new phase of matter was introduced called the topological phase. One of the most interesting phases of matter is the topological phase. First, the topological insulation was examined. The first topological insulation was observed in 1982 as the quantum Hall effect. A topological insulation in D will have the next D-1 topological boundary states that are protected by irregularities from scattering. Recently, this concept has been extended to a much higherorder topological insulation. For example, a three-dimensional topological insulator is a two-order insulator that does not have boundary states on two-dimensional faces But on the boundary of those facets one finds one-dimensional protected topological boundary states, in other words, the second-order topological insulation boundary is a typical topological insulation. So far, topological insulators have been investigated for square and cubic lattice. One of the interesting structures in the new spin material is the Kagome structure and studied the conditions of formation of higher order topological insulatio on this structure. In this thesis, the Kagome lattice is first modeled by the thight binding model with two hopping parameters and then the band structure of a triangular structure is calculated and plotted according to the ratio of the hopping parameters and by examining the band structure obtained conditions for higher order topological phase formation