US Defense Secretary Robert Gates left Beijing on Wednesday after concluding his four-day visit to China.
China on Wednesday reiterated that the United States should abide by the principles agreed by the two nations on handling Taiwan question.
The top US product safety official said on Monday the agency has failed to persuade Chinese makers of defective drywall to compensate American homeowners, in a dispute that threatens to mar strained trade ties.
Gates' trip includes tour of China's nuclear command center
The groundwork for President Hu Jintao's upcoming visit to the United States was laid out by China's visiting Foreign Minister Yang Jiechi on Wednesday after a meeting with US Secretary of State Hillary Clinton.
China continued to add pressure on the United States to reform its export controls on high-tech products, a key move Chinese officials say will ease the massive trade deficit between the two nations.
US and Chinese military officials met in Washington to discuss North Korea and maritime security in a bid to restart once-frozen bilateral military ties.