The SAC industry index has three main characteristics: first, the sample scope covers the Shanghai and Shenzhen stock exchange markets; second, the industry division of listed companies is unified in accordance with the classification standards of the China Securities Regulatory Commission; third, index withdrawal processing is performed for long-term suspended stocks.

Introduction: The Securities Association of China and China Securities Index Company released the China Securities Association Fund Industry Stock Valuation Index, referred to as the "SAC Industry Index".

The SAC Industry Index is an industry index across the Shanghai and Shenzhen stock exchanges compiled in accordance with the standards of the China Securities Regulatory Commission's "Guidelines for Industry Classification of Listed Companies". It is divided into 12 categories and 9 auxiliary categories of the manufacturing industry and 21 indexes, all based on December 2008

The 31st is the base day, and the base point is 1,000 points.