Since the establishment of diplomatic relations between China and the United States in 1979, China US relations have always been the focus of attention. According to material statistics, the trade volume between China and the United States increased from US $245000 in 1979 to US $33.378 million in 2008. The trade volume between the two countries increased rapidly. Both China and the United States occupy a tense position in each other's foreign trade, and their economic dependence on each other is becoming stronger and stronger. This also shows that the scale of Sino US trade has continued to expand, especially since China's accession to the WTO in 2001, the Sino US trade volume has increased at a rate of 20% every year. By 2008, the United States had become China's second largest trading partner, China's largest export market and sixth largest import source, and China was the second largest import source and fourth largest export market of the United States.

Current situation of Sino US trade relations

According to the statistics of the U.S. Department of Commerce, the bilateral import and export volume of goods between the United States and China in 2015 was $598.07 billion, an increase of 1.3%. Among them, US exports to China were 116.19 billion US dollars, down 6.1%, accounting for 7.7% of the total US exports and promoted by 0.1 percentage point; Imports from China amounted to US $481.88 billion, an increase of 3.2%, accounting for 21.5% of the total imports of the United States, with an increase of 1.6 percentage points. The US trade deficit was US $365.69 billion, an increase of 6.6%. Moreover, China has surpassed Canada to become the largest trading partner of the United States, while the United States is China's second largest trading partner. China's large foreign exchange reserves and great trade surplus with the United States will inevitably exacerbate Sino US trade frictions.

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Causes and analysis of Sino US trade friction

The great trade balance between China and the United States is the direct cause of trade friction

"Chinese economist Stiglitz believes that if the current account deficit between the two countries exceeds 1.5% of the gross national product, there will be fierce friction; if it exceeds 2%, it will trigger retaliatory measures; if the country to country trade surplus exceeds 25% - 3% of the country's trade volume, it is a political issue." at present, China US trade cooperation depends deeply on each other, Trade friction has also become an urgent problem to be analyzed and solved. At the same time, the trade deficit between China and the United States has deepened American trade protectionism. When Trump came to power in 2016, he made the remark that China was raping the United States in response to the trade deficit between China and the United States. The next step is bound to strengthen trade cherishing.

The contradiction between the rapid development of economy and the expansion of world market

The economic development of blow molding machine is closely related to the proportion of market share. In recent years, in the global market, countries continue to compete for the market, but the market has become a scarce resource for economic development. In Sino US trade relations, the United States hopes to increase its exports to the Chinese market and occupy more market share in China in terms of capital, energy and communication. Take the plastic blow molding machine as an example. The United States has always been committed to capturing more shares. Through exchange rate regulation, the state makes the price of blow molding machine two to three times higher than that of domestic brands. It cherishes some domestic enterprises and does not safely open the Chinese market. China's cherishing of its own trade will inevitably exacerbate the trade friction between China and the United States.