By MICHAEL WINES


KASHGAR, China - A thousand years ago, the northern and southern branches of the Silk Road converged at this oasis town near the western edge of the Taklamakan Desert. Traders from Delhi and Samarkand unloaded their pack horses here and sold saffron and lutes along the city’s cramped streets. Chinese traders, their camels laden with silk and porcelain, did the same.

The traders are now joined by tourists exploring the donkey-cart alleys and mud-and-straw buildings once window-shopped, then sacked, by Tamerlane and Genghis Khan.

Now, Kashgar is about to be sacked again.

Nine hundred families already have been moved from Kashgar’s Old City, “the best-preserved example of a traditional Islamic city to be found anywhere in central Asia,” as the architect and historian George Michell wrote in the 2008 book “Kashgar: Oasis City on China’s Old Silk Road.”

Over the next few years, city officials say, they will demolish at least 85 percent of this warren of picturesque, if run-down homes and shops. Many of its 13,000 families, Muslims from a Turkic ethnic group called the Uighurs, will be moved.

In its place will rise a new Old City, a mix of midrise apartments, plazas, alleys widened into avenues and reproductions of ancient Islamic architecture “to preserve the Uighur culture,” Kashgar’s vice mayor, Xu Jianrong, said.

Many residents in Kashgar’s Old City will move to new buildings.

Demolition is deemed an urgent necessity because an earthquake could strike at any time, collapsing centuries-old buildings and killing thousands.“The entire Kashgar area is in a special area in danger of earthquakes,” Mr.Xu said.

Critics fret about a different disaster. “From a cultural and historical perspective, this plan of theirs is stupid,” said Wu Lili, the managing director of the Beijing Cultural Protection Center, a nongovernmental group devoted to historic preservation. “From the perspective of the locals, it’s cruel.”

Kashgar, though, is not a typical Chinese city. Chinese security officials consider it a breeding ground for a small but resilient movement of Uighur separatists who Beijing claims have ties to international jihadis. So redevelopment of this ancient center of Islamic culture comes with a tinge of forced conformity.

Chinese officials have offered somewhat befuddling explanations for their plans. Mr.Xu calls Kashgar “a prime example of rich cultural history and at the same time a major tourism city in China.” Yet the demolition plan would reduce to rubble Kashgar’s principal tourist attraction, a magnet for many of the million-plus people who visit each year.

Although the city offers the displaced residents the opportunity to build new homes on the sites of their old ones, some also complain that the proposed compensation does not pay for the cost of rebuilding.

“My family built this house 500 years ago,” said a beefy 56-year-old man with a white crew cut, who called himself Hajji, as his wife served tea inside their two-story Old City house. “It was made of mud. It’s been improved over the years, but there has been no change to the rooms.”