"We should build an open platform of cooperation and uphold and grow an open world economy," Xi said in his opening address outlining China's vision.
"Spanning thousands of miles and years, the ancient silk routes embody the spirit of peace and cooperation, openness and inclusiveness, mutual learning and mutual benefit," he said.
Xi announced that China will contribute an additional 100 billion yuan (about USD 14.5 billion) to the USD 40 billion Silk Road Fund to scale up financial support for the Belt and Road Initiative.
In addition to that, he also announced special lending schemes worth 380 billion yuan (USD 56 billion) to support cooperation on infrastructure, industrial capacity and financing.
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Xi also pledged an additional assistance worth 60 billion yuan (USD 9.5 billion) for developing countries and international organisations participating in the initiative to improve people's well-being over the next three years.
Xi said the Belt and Road initiative is "a project of the century" that will benefit people across the world.
China will also set up 50 joint laboratories with countries participating in the Belt and Road initiative to enhance cooperation on innovation, he said.
Named after the historic Silk Road, the Belt and Road initiative was proposed by Xi in 2013 to chart out new territories for international cooperation.
Pakistan Prime Minister Nawaz Sharif, Sri Lankan Premier Ranil Wickramasinge, Russian President Vladimir Putin and Turkish President Recep Tayyip Erdogan were among the world leaders who attended the high-profile meeting.
The United States sent a delegation led by Matt Pottinger, special assistant to the president and senior director for Asia at the National Security Council.
The B&R includes a maze of roads and port projects. While CPEC is highlighted as "flagship project", the B&R includes the Bangladesh, China, India and Myanmar (BCIM) Economic Corridor, New Eurasian Land Bridge, China-Mongolia-Russia Economic Corridor, China-Indochina Peninsula Economic Corridor and 21st century Maritime Silk Road.
The two-day forum, which also features a round-table summit of global leaders on Monday, is one of the highest- level assemblies in today's world, state-run Xinhua news agency reported.
"It has once again put China on centre stage," he was quoted as saying.