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Second, the G20 economies should strengthen the global multilateral trade system and push forward the Doha trade talks.

China will also select and train astronauts for other countries "at a proper time" and these astronauts will jointly conduct spaceflights with Chinese counterparts, he said, adding exchanges will be conducted with other countries in this field.

In the new year, Kerry said, the United States hopes to boost exchanges and cooperation with China, remain committed to building a new model of major country relations and jointly cope with global challenges so as to exercise more positive influences on the world.

The Chinese premier was aware of the difficulties in the process of urbanization, in which more than 100 million people are set to be absorbed into cities over the next decade or so.

The birth policy will be adjusted and improved step by step to promote "long-term balanced development of the population in China," it said.