President Xi Jinping on Saturday warned against "Taiwan independence," saying that China will never allow the tragedy happen again, state media Xinhua reported.
"We will resolutely contain 'Taiwan independence' secessionist activities in any form," said Xi when joining a group of lawmakers from Shanghai on the first day of the national legislature's annual session.
"We will safeguard the country's sovereignty and territorial integrity, and never allow the historical tragedy of national secession to happen again," Xi said.
"This is the common wish and firm will of all Chinese people. It is also our solemn commitment and our responsibility to history and the people," he said.
Beijing has repeatedly warned against any moves towards independence since January's landslide win by Tsai Ing-wen and her Democratic Progressive Party (DPP) in Taiwan's leadership elections.
Tsai has said she would maintain peace with China, and Chinese state-run media have also noted her pledges to maintain the "status quo" with China.
The cross-strait ties have been calm in the past eight years after the election of the China-friendly Ma Ying-jeou as leader in 2008 and his subsequent re-election.
"Compatriots from both sides of the Taiwan Strait are expecting the peaceful development of cross-Strait relations, and we should not disappoint them," he said.
"We will adhere to the 1992 Consensus as a political foundation, and continuously advance the peaceful development of cross-Strait ties," said the president.
The 1992 Consensus clearly defines the nature of cross-Strait ties, and is the basis for the peaceful development of cross-Strait ties in the long run.
Chen Weiwen, a national legislator and head of the Taiwan Democratic Self-Government League Guangdong Provincial Committee, said Xi's remarks reiterate the Chinese mainland's bottom line. It is also a stern warning against the Taiwan independence activists.