WASHINGTON, March 28 (Reuters) - The Biden

administration is drawing up a list of advanced Chinese

chipmaking factories barred from receiving key tools, three

people familiar with matter said, to make it easier for

companies to stem technology flows into China.

The list could be released in the next few months, one of

the people said.

The Commerce Department in 2022 barred U.S. companies from

shipping equipment to Chinese factories producing advanced

chips, as the U.S. seeks to severely limit Beijing's

technological advances over national security concerns.

But companies say it is difficult to pinpoint which

factories in China produce advanced chips and have long urged

the Commerce Department to publish a list.

The effort shows the United States is taking pains to

strengthen its existing chips restrictions on China by making it

easier for U.S. firms to comply with restrictions.

The Commerce Department declined to comment and the Chinese

Embassy in Washington did not immediately respond to a request

for comment.

Officials addressed the companies' request at an annual

export controls conference in Washington, D.C. this week.

"People are like, 'please, just tell us which are these

advanced that you really care about,'" said one

official, speaking on a panel, and confirming work on the list.

"It's probably not going to be an exhaustive listing, if we

can do that. But the more that we can help identify what are

these facilities that we have a concern with, hopefully that's

going to help," the official added.