The first-and second-tier blue chips mentioned in the stock market are relative and not clearly defined, and what some people think of as first-tier blue chips is second-tier in the eyes of others. Generally speaking, the recognized first-line blue chips refer to stocks with stable performance, large liquidity and total share capital, that is, stocks with greater weight.

For example, the first-line blue chips mentioned in Shanghai and Shenzhen stock markets usually refer to: Sinopec, China Unicom, Baosteel, China Merchants Bank, Changjiang Electric Power, Huaneng International and other aircraft carrier-level companies with super-large market value in the domestic capital market, excellent performance and relatively monopoly position in the same industry in China.

In the A-share market, the second-tier blue chips generally refer to the index stocks or non-index stocks such as Shanghai Automotive, Wuliangye, ZTE, etc., whose total share capital and circulating share capital are slightly less than those of the first-tier blue chips, but they are also very large, with a relatively large market value, a relatively large scale and very good performance. In fact, these companies are also well-known leading enterprises within the industry (if viewed from the inside of the industry alone, they are in their respective industries)