Geng said China wants that the new USA administration and its leadership fully recognise the sensitivity of the Taiwan question, stick to One-China policy as well as principles established by the three joint communiqués between China and United States and properly deal with the Taiwan related questions in a prudent manner so as not to disrupt or damage over all interests of the bilateral relationship.
Geng Shuang, a spokesman for China's foreign ministry, said Monday that established policy is the "political foundation" of any diplomatic relationship between China and the USA, and that any damage to it could make cooperation between both sides "out of the question", the Associated Press reported.
In kind, China said it has "serious concern" regarding his latest comments and said relations with the USA could be strained.
The One China policy was the "political bedrock" for relations with the US, he added, and if it was "compromised or disrupted", sound and steady growth in China-US relations and cooperation in major fields would be "out of the question", he told reporters.
"The name of the [US"] "one China' policy might stay the same, but the content has been altered; the telephone call between President Tsai Ing-wen (蔡英文) and Trump earlier this month was not improvised, but an offensive that was followed by another", Hsu said.
An editorial in the Global Times described the president-elect as "an ignorant child" whose "lack of hands on experience" could spark real crisis.
But as Mr Trump has repeated his campaign criticisms of China - and as his statements about Taiwan have rippled throughout the region - Beijing has noticeably hardened its tone.
Some U.S. analysts warned that Trump could provoke a military confrontation if he presses the Taiwan issue too far.
The Chinese-language commentary was in response to Trump's remark in a Fox News interview on Sunday that he did not see why the U.S. must "be bound by a one China policy unless we make a deal with China having to do with other things, including trade".
Hours after the interview aired, China's Communist Party-controlled Global Times published a Chinese-language editorial headlined: "Trump, please listen clearly: "One China" can not be traded". But Trump said without concessions from China, he did not see why it should continue.
"By putting One China up for grabs, Trump will suck all the oxygen out of the US-China relationship, and it risks eventually trading away US support for Taiwan for another US interest", he added.
Chinese officials had no immediate reaction to Trump's remarks.
The Trump call, which helped Tsai draw global attention to the democratically run nation's increased isolation in the shadow of a rising China, may have been a first step to upending the balance, weeks before Trump takes office on January 20. He said it was not up to Beijing to decide whether he should take a call from Taiwan's leader. "You have nuclear weapons and China could solve that problem and they're not helping us at all". "I think it actually would've been very disrespectful, to be honest with you, not taking it", he had said. Still, he abided by the terms of the 1979 joint communiqué that established relations between the United States and China.
"Many people might be surprised at how the new US leader is truly a "businessman" through-and-through", the paper said.
But Green, who is now with the CSIS think tank, said he did not believe that Trump meant to go that far and there was "logic to serving Beijing notice that he will not be dictated to on issues like Taiwan".