Research team at Nanjing University led by Professor Yijun Feng proposed several RIS-assisted wireless communication signal enhancement systems, and achieved good research results with a series of theoretical researches and experimental investigations. The team developed different high-efficiency reflective RIS prototypes to overcome the problem of high insertion loss, including electrically controlled 1-bit/2-bit RIS and electro-mechanical RIS with continuously/discretely tunable phase. With a variety of indoor complex scenario tests, it shows that the communication signal quality is significantly improved. The team also developed an omni-directional intelligent surface to reduce the deployment density and make full use of space resources. The communication signal quality of the forward and backward space are both significantly improved in indoor scenario tests.