With the component settings on the "Reconfigurable Intelligence Surface (RIS)", the state of electromagnetic waves in the environment can be "dynamically" adjusted to further achieve the vision of controlling the electromagnetic environment. Among them, the most forward-looking advantage is that the RIS can guide electromagnetic waves to the non-line-of-sight area (NLOS) to extend the coverage of the original base station and reduce the construction of a large number of base stations. to achieve a more economical communication