The relationship between PTA and styrene is oil-based chemicals. Especially when the profit of its own industry is compressed to a lower level, the trend will basically follow PTA, which is the English abbreviation of purified terephthalic acid and one of the important bulk organic raw materials. Its main purpose is to produce polyester fiber, polyester bottle and polyester film, which are widely used in chemical fiber, light industry, electronics, construction and other aspects of the national economy, and are closely related to people's living standards. PTA futures, that is, the dominant trading variety with phthalic acid as the subject matter, is a futures variety listed on Zhengzhou Commodity Futures Exchange.