The leaders spoke for an hour on Monday, agreeing on the role of the G20 and BRICS in defending multilateralism," Brazil's presidency said in a statement, Reuters reported.
"Both presidents also highlighted their willingness to continue identifying new business opportunities between the two economies," the statement said.
Lula said last week he would initiate a conversation about how to tackle Trump's tariffs with BRICS nations, after Trump dubbed the group "anti-American" and threatened them with additional tariffs.
Xi called BRICS a key platform for building consensus in the Global South and said China is ready to work with Brazil to set an example of unity and self-reliance among major Global South nations, Chinese state media Xinhua reported.
Agriculture trade features notably in China and Brazil's relations.
China, the world's biggest soybean importer, gets most of the commodity from Brazil and recently, numerous Brazilian coffee companies found entry into the Chinese market after the industry was hit by steep US tariffs.
China last week also showed Brazil support in resisting the "bullying behavior" of imposing excessive tariffs, without naming the US.
Xi described ties between the two countries as "at their best in history", and said both should work together to address global challenges and promote the political settlement of the Ukraine crisis, Xinhua said.