Abstract: Optical transmission and regulation is an important basis for the development of photonic integrated devices. As a new optical functional material, photonic crystals have great potential in optical manipulation. Inspired by the concept of topological phase in condensed matter physics, the introduction of topological phase in photonic crystal energy band system research breaks through the traditional light field regulation ideas based on the superposition principle of real space light field and the inverse space solid energy band dispersion theory, and provides a novel light field regulation mechanism, rich transport and light control properties, such as high dimensional light field regulation. In this paper, the research achievements of the research group in recent years were reviewed from two aspects: non-Hermitian photon system and topological photonics system. Firstly, the background of optical topology research and optical non-hermitic research was reviewed. Then, the research progress in the fields of high-order photonic topological insulators, high-order quantum spin hall effect, topological field local area of photonic crystals and topological optical transmission in non-Hermitical systems were introduced. In the end, the development trend of the research results in related fields such as optical quantum computing and optical communication was summarized and prospected.