President Hu Jintao arrived on Tuesday on the first visit by a Chinese head of state to Japan in 10 years for talks aimed at easing tensions between the Asian powers.
An Air China plane carrying the Chinese leader landed at Tokyo's Haneda airport under tight security, with a highway heading into the metropolis temporarily shut down.
More than 200 Chinese diplomats, businessman and students welcomed Hu by waving the Chinese and Japanese flags and holding up bouquets of red and pink flowers.
China will also pledge to "actively join" a post-Kyoto Protocol deal on tackling global warming, in a planned joint statement with Japan during Jintao's visit.
Multilateral negotiations are underway for completing a pact by the end of next year to follow the landmark Kyoto Protocol, which requires rich nations to slash greenhouse gas emissions blamed for climate change.
The United States and some other Western states have baulked at making mandatory cuts as developing nations such as China, one of the world's biggest emitters of carbon dioxide, are not bound to slash emissions under Kyoto.
China has been cautious about setting binding emission cut targets for developing countries, arguing that such nations are responsible for current levels.
"Japan and China plan to announce a joint statement on climate change during President Hu Jintao's formal visit to Japan," the Japanese foreign ministry said late on Monday in a statement.
"Both sides will actively join the negotiations on strengthening an effective process and a framework" after the Kyoto Protocol expires at the end of 2012, the statement said.
"China will take notice of Japan's view that the world as a whole needs to slash greenhouse gas emissions at least by half by 2050 from the current level, and China will show its willingness to study ways and measures to realise the ultimate purpose" of the UN framework on climate change, it said.