He also said that Xi had promised him that the Chinese government would crack down harder on fentanyl shipments from China to the US, and tweeted a quote from a Bloomberg story which said that China was ready to restart imports of USA products, including soybeans and natural gas.
Growth in imports for November slowed sharply to 3.0 percent from a 21.4 jump in October, and far missed analysts' forecast of 14.5 percent.
The customs data showed that annual growth for exports to all of China's major partners slowed significantly.
The president's optimism comes just after a day since he publicly declared himself a "Tariff Man", and stood by his protectionist trade policies even after stocks fell almost 800 points amid confusion over the result of Trump's meeting with Chinese President Xi Jinping.
The new export order component in China's official purchasing managers' index had been contracting since June and barely picked up in November. Imports of iron ore fell for a second time, reflecting waning restocking demand at steel-mills as profit margins narrow.
Gao's briefing came hours after the trade detente risked being rattled by the arrest in Canada of a top executive from Chinese telecom giant Huawei at the request of the United States.
China's President Xi Jinping and US President Donald Trump attend a welcome ceremony at the Great Hall of the People in Beijing on 9 November 2017.
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In a note, analysts at Haitong Securities in Shanghai said "Growth in shipments of Chinese goods on US$200 billion tariff list has started to pull back, indicating that frontloading effects may be starting to recede".
China's overall trade - what it buys and sells with all countries, including the U.S. - logged a United States dollars 44.7 billion surplus in November, up from USD 35 billion the previous month, the data showed.
For trade with all countries, China's surplus was US$44.74 billion for November, compared with forecasts of US$34 billion and October's surplus of US$34.02 billion.
For its part, China has said it will import more USA products to reduce its trade surplus, but no dollar amount has been publicly discussed. Despite those new tariffs, the trade gap with China also widened in October, increasing by $700 million to $38.2 billion.