Topological materials have a wide range of applications. In addition to being used in integrated circuits, they also have great application potential in other fields. For example, after being excited by polarized light, the spin polarized photocurrent will be generated on the surface of topological materials, which can be used to build new photoelectric devices; With the excellent mechanical flexibility, conductivity and light transmittance of thin-layer topological materials, a new flexible transparent electrode can be constructed, which can be applied in the field of portable wearable devices in the future; Using the strong spin orbit coupling effect in topological materials can bring excellent thermoelectric merit ZT, making it an excellent thermoelectric material.