1. Relationship between supply and demand: If the market supply exceeds demand, the price of futures plastics will fall, and vice versa. The relationship between supply and demand is affected by factors such as production capacity, inventory, consumption, import and export.

2. Macro-economy: The growth or decline of macro-economy will affect the demand and cost of plastic industry, thus affecting the future plastic price. For example, the impact of epidemic situation, trade friction and policy adjustment will all cause macroeconomic uncertainty and restrain or stimulate the rise or fall of futures plastic prices.

3. Crude oil price: Crude oil is one of the main raw materials for plastic production. The fluctuation of crude oil price will directly affect the cost and profit of plastics, thus affecting the future plastic price. Generally speaking, the rise of crude oil price will lead to the rise of futures plastic price, and vice versa.