"If the brothers are of the same mind, their sharpness can cut through metal," Xi, the new General Secretary of the ruling Communist Party of China (CPC) told Lein, honorary chairman of Taiwan's ruling Kuomintang party.
Lein is on a rare goodwill tour of China to firm up the ongoing peace process between the two sides, separated in 1949 after a bitter war between Communists and democratic forces.
"It is the duty of the new CPC leadership to continue promoting the peaceful development of cross-Strait ties and the peaceful reunification of the two sides of the Taiwan Strait," Xi said.
"We will maintain consistency in policies toward Taiwan, by unswervingly upholding the one-China principle and continuing to promote cross-Strait exchanges and cooperation," Xi, who would be taking over as the Chinese President next month told his guest.
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The compatriots from both sides of the Taiwan Strait can cooperate in realising the "Chinese dream", Xi was quoted by the state-run Xinhua news agency as saying.
For a long time both sides had military tensions as Taiwan remained a close ally of the US.
The two, however, worked for improvement of cross-strait ties in the last few years with series of initiatives, including a free trade treaty.
The relations improved to such an extent that over 70,000 mainland Chinese visited Taiwan in the last ten days to celebrate the Chinese New Year, celebrations of which were ended yesterday.
Unremitting efforts will be made to consolidate and strengthen the political, economic, cultural and social foundation for the peaceful development of cross-Strait relations, Xi said.
Nothing can cut the blood bond between Mainland and Taiwan compatriots who all belong to the Chinese nation, and nothing can change the fact that both sides on the Taiwan Strait belong to one China, he said.