NEW YORK - There's a good reason schools across the country are scrambling to find people who can teach Chinese: It's quickly becoming business' second language as Wall Street seeks to tap China's $1.3 trillion in foreign reserves.

China has been making increasingly aggressive investments in some of the world's most prestigious financial companies in recent months - most of them American. Morgan Stanley, the Bear Stearns Cos. Inc., the Blackstone Group L.P., and Britain's Barclays P.L.C. have all negotiated major stakes by Chinese government-controlled investment funds.

Investment banks ailing from the subprime-mortgage mess are looking for money to shore up their balance sheets. And China is leading a surge of strategic investments from Asia and the Middle East that so far have sunk about $25 billion into Wall Street banks.

That is just the start of what some say is a dramatic reversal of financial power in the shadow of Wall Street's credit turmoil.

"Both Chinese private and government interests are controlling more and more of the U.S. economy, and this is a result of the big trade and budget deficits we have," said Alan Donziger, professor of economics at Villanova School of Business. "These investments will make the U.S. . . . less independent, but this is inevitable when we live in a global economy."

To be sure, Wall Street's current predicament is "our own doing," he said. Turmoil in the credit markets has been fueled by defaults on subprime mortgages, and that has caused the Federal Reserve to attempt a bailout of the industry through interest-rate cuts.

Lower interest rates have caused the dollar to slide in value against other major currencies. And, for foreign governments, the devalued dollar makes investments in these financial institutions cheap.

In the 1980s, Japanese investors snapped up real estate and invested in businesses across a number of sectors. This new wave of foreign investment is different because Asian and Middle Eastern governments are taking stakes in financial institutions - a cornerstone of the U.S. economy.

China agreed to pay $5 billion for a 9.9 percent stake in Morgan Stanley, and those securities pay 9 percent a year until they convert into shares in 2010. That translates into a gain of about $450 million in cash next year.

But, for Morgan Stanley investors, the infusion of new stock two years from now will dilute their shares - and potentially make owning Morgan Stanley's securities less valuable. The same can be said about other banks that receive foreign investments.

The deals have been structured so that the sovereign funds are passive investors with no seat on the board, and this escapes regulatory scrutiny. President Bush said Thursday that he was "fine" with foreign investors snapping up big stakes in U.S. banks and financial firms.

By keeping investments under 10 percent, it does not trip an automatic review by the government. Bush and others say they believe the injection of foreign capital helps keep the banks competitive and restores faith in an industry beaten down this year.

"These are noncontrolling investments, provides capital, and really is a statement of confidence," said John Douglas, a partner with law firm Paul, Hastings, Janofsky & Walker L.L.P. who heads its global bank regulatory practice. "There's a lot of good things here."

But, some banking analysts say they believe these government-sponsored funds may be getting more say than the banks are admitting.

"The Chinese are putting $5 billion into Morgan Stanley without there being some kind of quid pro quo of what they're going to get other than interest on their investment," said Dick Bove, an analyst with Punk, Ziegel & Co. L.P. "It's part of a major shift in the worldwide financial system that I think will be very negative to the U.S."

He said that these kinds of investments were not over and that he expected to see others surface next year. In some cases, investment banks that have already received investments might strike other deals to increase capital.

Next up? Speculation swept through Wall Street on Friday that Merrill Lynch & Co. Inc. is on the hunt for a foreign investment to help cushion what could be a huge fourth-quarter write-down in January.

"The whole situation has changed with financial power moving dramatically toward China and the Middle East, and that will have significant impact over time," Bove said.