The Obama administration has been making great efforts to build a broad partnership with China, but US President Barack Obama or his successor has to face the reality that competition has outweighed cooperation in Sino-US ties.

Therefore, some leading US experts argue that Washington and Beijing should manage competition while expanding cooperation to keep the relationship heading in the right direction.

The past three-and-a-half years have witnessed an unprecedented number of high-level exchanges between Chinese and US officials, including 12 meetings between President Hu Jintao and Obama, the annual Strategic and Economic Dialogues, the Joint Commission on Commerce and Trade, and many military exchanges.

In addition, the world's two largest economies have worked together on a series of global and regional issues, such as the global financial crisis, climate change and nuclear security.

But despite all the communication and cooperation, strategic mistrust is still growing, the number of trade disputes is increasing, and more and more people in the United States regard China as a competitor instead of a partner.

A recent PEW Research Center survey shows that 66 percent of the general public, and the majority of five expert groups (government, military retirees, business, scholars and media), said they see China as a competitor of the United States.

At the same time, a majority of both the US public and the experts said the US cannot trust China.

About half of US citizens say the Asian nation's emergence as a world power poses a major threat to the US.

And most respondents said they regard the large amount of US debt held by China, the loss of US jobs to China and the US trade deficit with China as very serious problems.

As George Washington University professor David Shambaugh said in his new book Tangled Titans, the fundamental elements of China-US relations have changed since the 1990s, as have the nations' perceptions toward each other.

Shambaugh - an internationally recognized expert on Chinese studies - has visited the country in 32 consecutive years and spent 2009-10 on a sabbatical as a senior Fulbright scholar there.

He said in the book that his recent experience in China told him that "something more basic and something very negative was transpiring in US-China relations."

To probe the deeper dynamics and the forces driving the relationship, Shambaugh and 15 other top scholars in the field recently debated the current state of China-US ties.

They said the major theme of the relationship in the short and medium term is that the two big powers are closely tied together with extensive cooperation and growing competition, a "new normal" called "coopetition."

What has really changed, Shambaugh said, is the balance of cooperation and competition.