China says the United States is building up its military presence in the Asia-Pacific region through stronger alliances and increased security involvement.
It also says there has been a rise in operations directed against China.
The views are contained in a white paper on national defence, issued by the government.
It says profound changes are taking shape in the Asia-Pacific strategic landscape where major powers are increasing their strategic investment and international military competition remains fierce.
The document singles out the United States. According to China, it is reinforcing military alliances and getting more involved in regional affairs.
Beijing also acknowledges that foreigners are now more suspicious of China - and have increased their "interference and countering moves" against it.
Relations between China and the United States, particularly on military matters, have been strained over recent years.
The BBC reports that no issue threatens the relationship more than US support for Taiwan, a self-governing island off China's eastern coast that Beijing considers its own.