Although sugar has an external market, domestic sugar is basically self-sufficient and has little contact with foreign sugar. Only precious metals, copper and zinc are most affected by the external market in China, and there is basically no pricing power in China. Therefore, it is difficult to see these varieties in Changzhuang, usually in the middle of the band. Oil residue is the second, influenced by the external disk, but the trend is not necessarily the same, so it affects each other. Rubber is greatly influenced by Japanese natural rubber, but it can basically walk independently in recent years.