From July 28th to 29th, the National Caustic Soda Industry Technology Annual Conference organized by the association was held in Chongqing. 350 representatives from chlor-alkali production enterprises, scientific research units and related equipment service units attended the meeting. Zhang Xin, deputy secretary general of the association, presided over the meeting. Zhang Wenlei, vice president and secretary general of the association, reported the economic operation of the industry in the first half of the year, put forward the work priorities for the second half of the year, and put forward suggestions for further improving the technical exchange and technological innovation of the industry. Liu Yancai, head of the caustic soda expert group of the association and general manager of Shaanxi Beiyuan, made a key report on the technical development of the chlor-alkali industry under the new situation; Yin Simin, director of the National Energy Conservation Center, made a policy interpretation on building a market-oriented green technology innovation system; the association did the chlor-alkali industrys "Thirteenth Five-Year" development review and the "14th Five-Year" development prospect, and the theme report on the analysis of the economic operation of the chlor-alkali industry in the first half of 2020; Tianjin Dagu, Ningbo Wanhua, and Shandong Binhua have relocated and built new facilities respectively. Some issues that should be paid attention to in design and construction, summary of energy saving and consumption reduction of caustic soda plants and special reports on the development of chlor-alkali automation, digitalization and intelligence; New opportunities to jointly create a new future for scientific and technological services, a special report on the research and development progress report of domestic chlor-alkali ion membrane and the introduction of chlor-alkali hydrogen energy strategic planning; De Nora, Chemours Chemical, Jiangsu Ankate and Shenyang Bluestar Cleaning respectively introduced ion membrane and The latest technology of electrolytic cell structure and the research and development in the field of by-product salt electrolysis; Shanghai Yulong and Jiangsu Jiuwu respectively introduced the application of the latest technology of brine filtration membrane; Xian Jiaotong University and Shandong Xihui introduced the comprehensive utilization technology of salt mud; Asahi Organic Materials, Shanghai Lilac, Beijing Dongfen, etc. respectively introduced the issues of concern to the industry such as special valves for electrolysis, electrochemical cooling water treatment technology and online analysis technology; the meeting organized a caustic soda expert group meeting on the evening of the 27th and opened It also organized key enterprise sub-venues and enterprise exhibition booth exchanges.