Dec. 29, 2009 -- The U.S. Commerce Department said that it had set preliminary anti-dumping duties on imports of steel grating from China. The department said that it is currently scheduled to make its final determination in April 2010.

Nov. 24, 2009 -- the United States made a decision to impose duties ranging from 10.36 percent to 15.78 percent on Chinese oil well pipes for alleged unfair subsidies.

Nov. 15, 2009 -- Nobel economics laureate and New York Times columnist Paul Krugman pushed for a stronger yuan in an article entitled "World Out of Balance". He wrote, "China's weak-currency policy siphoned much-needed demand away from the rest of the world into the pockets of artificially competitive Chinese exporters."

Appreciation of yuan could raise the cost of Chinese goods, hence weaken exports.

Sept. 28, 2009 -- China announced it would maintain anti-dumping measures on some imported polyvinylchloride from Sept. 29. The anti-dumping measures target PVC, one of the most widely used materials in the chemical industry, imported from the United States, the Republic of Korea, Japan and Russia.

Sept. 11, 2009 -- U.S. President Barack Obama made a decision to impose punitive tariffs on tires imported from China, setting punitive tariffs at 35 percent in the first year, 30 percent in the second and 25 percent in the third.

Sept. 13, 2009 -- China launched anti-dumping and anti-subsidies investigations into some automobile and chicken products originally produced in the United States.

Sept. 18, 2009 -- China's Ministry of Commerce organized industry experts to study possible anti-dumping investigations of its solar photovoltaic industry to be launched by the European Union and the United States.

June 26, 2009 -- China required a security deposit on adipic acid from the United States as a temporary anti-dumping measure, tariff ranges from 5.7 percent to 35.4 percent.

June 25, 2009 -- China announced to impose a temporary anti-dumping duty of 10.9 percent to 37.5 percent on polyamide-6 imported from the United States, Italy, Britain, France and Taiwan.

June 1, 2009 -- China began an anti-dumping investigation into grain oriented flat-rolled electrical steel imported from the United States and Russia. The investigation would conclude before June 1, 2010, under normal circumstances, but it could extend until Dec. 1, 2010, under special circumstances.

April 29, 2009 - China conducted anti-dumping investigations into imported nylon-6 chips originated from the U.S. and other countries and regions. The investigation will conclude before April 29, 2010 under normal circumstances, but it could extend until October 29, 2010 under special circumstances