The European Union's administrative body, meanwhile, urged the bloc's 27 member countries to join together in making euro200 billion (US$256.22 billion) in spending and tax cuts to boost economic growth and bolster the confidence of consumers and businesses.
China's 1.08 percentage-point cut - the fourth rate reduction in three months - reflects the government's urgency about raising private consumption and investment to supplement state spending on the stimulus package.
Interest on a one-year loan will fall to 5.58 percent, effective Thursday, while interest paid on deposits will drop to 2.52 percent.
"This is the most aggressive monetary easing in recent years and should bode well for China's market performance," said Jing Ulrich, chairwoman of China equities for JP Morgan & Co., in a report to clients.
The 4 trillion yuan ($586 billion) stimulus aims to insulate China from the global slowdown by injecting money into the economy through spending on new highways and other public facilities. But its ultimate goal is to increase consumer spending, which a rate cut is meant to encourage.
Beijing is trying to shore up consumer and investor confidence and reverse a sharp downturn in growth. China's economy is expected to expand by at least 9 percent this year, down from 11.9 percent last year. But communist leaders worry about rising job losses - especially in export industries hit by weak global demand - and possible unrest.
China has avoided a big hit so far from the global financial crisis because its banks are healthy and exports strong. But conditions are expected to worsen in coming months as export demand weakens and growth in real estate and other domestic industries slows.
Just this week, the World Bank cut its forecast for China's growth next year from 9.2 percent to 7.5 percent, the lowest level since 1990.
Beijing had been rumored to be considering a rate cut and Chinese stock markets fell Monday after one failed to materialize over the weekend. The cut Wednesday was announced after markets closed. The Shanghai Composite index, down two-thirds from its peak in October 2007, edged up 0.5 percent to 1,897.88.
Also Wednesday, the central bank cut the amount of money commercial banks must set aside as reserves, expanding the pool available for lending.
The moves are meant to "promote stable credit growth," the People's Bank of China said on its Web site.
The rate cut was China's biggest since 1997, said Standard Chartered economist Stephen Green. But he cautioned that rate cuts alone might not be enough to trigger a wave of house purchases and corporate investment.
"To be honest, rate policy in this environment is a marginal factor - businesses think about possible returns on investments, and households will look at house price prospects," he said in a report.
A key issue will be whether banks are willing to lend more. They have tried to shield themselves from global turmoil and the slowing real estate industry by cutting back on lending to exporters, developers and small companies.
"The degree of benefit realized from China's monetary stimulus will hinge on whether banks increase their lending to the most troubled sectors of the economy," Ulrich said.
In Brussels, Belgium, the European Commission outlined a two-year "European Economic Recovery Plan" that calls for EU members to spend 1.5 percent of the bloc's gross domestic product to halt a slowdown that has already pushed some European nations into recession.
The spending plan's euro200 billion price tag is much higher than the euro130 billion that EU officials had been discussing in recent weeks.
Some euro170 billion would come from national governments and include tax breaks, credit guarantees for ailing industries and to easy loans to encourage new green technologies. The remainder would be financed from the EU budget and the European Investment Bank.
"Exceptional times call for exceptional measures," European Commission President Jose Manuel Barroso said.
National leaders from the EU countries are to discuss the proposal at a Dec. 11-12 summit in Brussels.
On the Net:
People's Bank of China (in Chinese): http://www.pbc.gov.cn