Introduction: after the rapid development of domestic PS industry in recent years, China's overall PS production capacity and trade volume are also growing, with more frequent and convenient distribution of goods. In the past, local production enterprises mainly used to meet local demand. However, with the improvement of technology and the intensification of industry competition, the distribution of goods sources is becoming more and more diversified.

In 2016, China's PS enterprises were mainly concentrated in East China, including Zhenjiang Qimei, Jiangsu Leyton, Shanghai Secco, Ningbo Taihua, BASF, etc., with local production capacity accounting for 69.11% of the total domestic production capacity. The source of goods not only supplied to East China, but also flowed to North China, central China, South China, southwest and other places. In the later stage, the amount of East China's goods flowing into North China may increase.

Many manufacturers in East China have mature sales network in South China, and their agents and trade volume are large, such as Ningbo Taihua, Zhenjiang Qimei, Shanghai Secco and other enterprises. However, in recent years, the production enterprises in East China are also strengthening the sales in the north, so the amount of East China's goods flowing into the North may increase in the later period. 2. Increase in the flow of goods from South China to East China

Secondly, PS production capacity is concentrated in South China, with local production capacity accounting for 17.23% of the total domestic production capacity. The production enterprises include Guangdong Xinghui, new China and the United States, Guangzhou petrochemical, Huizhou Renxin, etc. Most of the local and import sources are mainly digested here, and a few flow to the southwest, central and East China through the way. The source of import goods from Taiwan, South Korea, Hong Kong, Thailand and other places gather here, with fierce competition. In previous years, the price of PS in South China is much higher than that in East China, the competitiveness of products in East China is poor, and the inflow of goods to East China is also small. However, this year, due to the small price difference between the two places, sometimes the price in South China is lower than that in East China, the amount of PS flowing into East China is more than that in previous years. 3. Increase in the flow of goods from North China to East China

Although there are few production enterprises in North China, Tianjin rentai is the only PS production enterprise in normal operation, but its supply has not only sold in North China, but also has its sales network in Jiangsu, Zhejiang and other places.

Conclusion: under the new situation and new competitive environment, the mutual circulation trend of domestic PS sources may be more obvious. Under the condition of domestic self-sufficiency, the volume of some competitive products transferred to export may continue to increase.