WASHINGTON, Feb. 8 (Xinhua) -- China and the United States should keep close contact and make good use of the established four high-level dialogue mechanisms to further promote bilateral exchanges and cooperation, said visiting Chinese State Councilor Yang Jiechi here on Thursday.

Yang, during his meeting with U.S. Secretary of State Rex Tillerson, also said that the two sides have decided to hold the second round of diplomatic and security dialogue in China at the first half of this year.