In the morning of August 23, 2021, led by Prof. Yidong Huang, Wei Zhang, Xue Feng, Fang Liu, and Haiou Zhang visited Beijing Yiqing Holdings Co., LTD., visited the exhibition hall, plant factory, optical fiber preparation workshop and test hall. Mingxing Guo, chairman and Party Secretary of Yiqing Holdings, and Yuncheng Ge, general manager, accompanied the group to visit and attend the conversazione. In the exhibition hall, Song Han, party secretary of Beijing Yiqing Research Institute affiliated to Yiqing Holdings, introduced the scientific research achievements and successful cases of product development of Yiqing. At the conversazione, Zhenyi Fang, the president of the Yiqing, comprehensively introduced the development history, operation mode, business content and future planning of the Yiqing. Prof. Yidong Huang introduced the relevant policies of Tsinghua University-enterprise joint laboratory. The two sides had an in-depth discussion on carrying out industry-university-research cooperation and would continue to promote the implementation of specific cooperation content.  Yuangang Duan, chief accountant of Yiqing Holdings, Qun He, minister of Strategic Development, and other leaders of Yiqing Holdings attended the conversazione.