China urges caution and opposes moves that increase tension.
The United States and its allies may boost their military presence in the Asia-Pacific region, citing Pyongyang's nuclear test, analysts said.
The comments came as China engaged in a flurry of diplomacy on Wednesday to ease regional tension.
"More drills by the US and its allies are possible in a bid to show their firm opposition to the nuclear test and other measures by Pyongyang they call provocative," said Wang Fan, an expert on Korean studies at the China Foreign Affairs University.
They will also quicken deployment of anti-missile systems in the name of containing the Democratic People's Republic of Korea, Wang said.
Washington, Seoul and Tokyo on Wednesday agreed to deepen cooperation to curb Pyongyang.
The DPRK conducted its third nuclear test on Tuesday in what its officials described as a "safe and perfect" way.
China held talks on Wednesday with countries involved in the Six-Party Talks.
Foreign Minister Yang Jiechi and his Republic of Korea counterpart Kim Sung-hwan talked over the phone and exchanged their views on the situation on the Korean Peninsula, the Foreign Ministry said on its website, without giving details.
Yang also talked with US Secretary of State John Kerry. Yang told Kerry that China explicitly stated its position on Pyongyang's nuclear test, urging all parties to keep focused and avoid escalation, according to the ministry.
All parties concerned should insist on a peaceful solution, resolve the Korean Peninsula issue within the framework of the Six-Party Talks, and maintain peace and stability on the peninsula and in Northeast Asia, Yang said.
On Tuesday, China said it firmly opposed the test.
The ROK president-elect, Park Geun-hye, on Wednesday condemned Pyongyang's test, saying "a stronger nuclear arsenal means deeper international isolation".
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