Xi addressed almost 30 leaders on the second day of a forum on his new Silk Road plan, an infrastructure project Beijing hopes will revive ancient trade routes from Asia to Europe and Africa.
"Globalisation is encountering some headwinds," Xi told leaders from Spain to Turkey, Russia and Pakistan at a convention centre near the Great Wall on the outskirts of Beijing.
"We need to seek results through greater openness and cooperation, avoid fragmentation, refrain from setting inhibitive thresholds for cooperation or pursuing exclusive arrangements, and reject protectionism."
At the opening of the meeting on Sunday, Xi pledged to pump an extra USD 124 billion into the China-bankrolled project, which involves a huge network of ports, railways, roads and industrial parks.
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The China Development Bank had already earmarked USD 890 billion for some 900 projects.
The initiative spans 65 countries representing 60 percent of the world population and around a third of global gross domestic product.
China has defended globalisation at a time when the United States is retreating into "America First" policies on trade and foreign relations under President Donald Trump.
"In a world of growth, interdependence and challenges, no country can tackle the challenges or solve the world's problems on its own," he said as he sat next to Russian President Vladimir Putin.
Putin and other leaders, including Turkish President Recep Tayyip Erdogan, applauded the initiative, which Xi unveiled in 2013.
"In these times, when the temptation is great to respond to the crisis of globalisation by increasing isolation, and by raising walls, this initiative highlights a vision of connectivity, cooperation and dialogue across Europe and Asia but also other parts of the world," Greek Prime Minister Alexis Tsipras said yesterday.
But some officials expressed caution.
German Economy Minister Brigitte Zypries called for transparency to ensure that the calls for investment bids are "non-discriminatory".
Some Belt and Road projects are already raising concerns in certain countries.
India skipped the summit as it voiced displeasure at the China-Pakistan Economic Corridor, a Belt and Road project aimed at linking northwestern China to the Arabian Sea.
The route cuts through Gilgit and Baltistan in Pakistan- administered Kashmir, disputed territory that India claims is illegally occupied.