“Tremendous progress” has been made in talks with Chinese President Xi Jinping, Donald Trump said on the summit’s second and final day.
“I think truly progress has been made,” the US president said, declaring the relationship as “outstanding”.
The two men and their staff sat face to face for talks at Mr Trump’s Mar-a-Lago retreat in Florida.
Last year Mr Trump said China had “raped the US” and vowed to brand the superpower a currency manipulator.
But at a welcome banquet it was all smiles and the good spirits appeared to continue on Friday as Mr Xi’s visit concluded with a working lunch.
On the night of the Chinese president’s arrival, a US airstrike on an airbase in Syria was launched in response to a suspected chemical weapons attack.
The attack was made public on Thursday evening just moments after Mr Xi and his wife left the resort following dinner.
Beijing has avoided publicly taking sides on the issue.
China’s position on Syria is much closer to Russia’s than to the US.
And the Chinese government will guess that the timing of the American missile strike was a blunt message that without more robust Chinese help on dismantling Kim Jong-un’s nuclear programme, the next target for pre-emptive American military action might be North Korea.