Over the weekend, hundreds of protesters gathered outside the Chinese consulate in Istanbul.
Tourists have been warned to avoid filming protests or going out alone.
China said it has always attached great importance to and fully respects the freedom of Muslim religious beliefs.
A statement from the government said accusations in the Western media that religious rites had been banned in western China's Xinjiang province this Ramadan were "completely at odds with the facts".
Turkish Muslims and Chinese Uighurs share ethnicity and have close cultural and religious ties.
Ankara summoned the Chinese ambassador last week over reports that Beijing had banned Uighurs from fasting and worship during the holy month.
Hundreds have died in violent attacks in Xinjiang in recent years. China blames the violence on Islamist terrorist groups but Uighur groups say the unrest is being fuelled by Beijing's repressive policies.
On Sunday, protesters at the Chinese consulate were pictured burning the Chinese flag and holding banners, one of which said "Turkey save your Brother - China get out from East Turkestan".
China crushed the short-lived state of East Turkestan in 1949. It established the Xinjiang Uyghur Autonomous Region in 1955.
The Chinese foreign ministry said there had recently been "multiple" demonstrations in Turkey targeting the Chinese government and "several" Chinese tourists had been attacked.
Turkish media reported a group of Korean tourists believed to be Chinese were attacked and tear gas was used by police to disperse protesters.
The last year has seen a crackdown in Xinjiang on what China describes as "terrorism driven by religious extremism".
In some places, the government has banned Uighurs from buying knives and women from wearing veils.
Security check points have been set up on roads and near markets and shopping malls.
In previous years, students have told the BBC they have been prohibited from taking part in Ramadan fasts, and government departments have restricted civil servants.
On microblog Weibo, one Chinese user, Dan Duo Duo 35, said: "Our policies towards ethnic minorities are still not good enough? They have less strict requirement for university exams, special prayer rooms in airports, and food labelled with Halal.
"The Han people are the disadvantaged one."

Ritzy Cinema workers in Brixton get paid a minimum of £8.80 an hour. Bectu is calling for an increase to £9.40 an hour.
Union bosses said Picturehouse Entertainment is being "very hard faced" and has refused to negotiate.
Picturehouse said pay would rise to £9.10 an hour on 2 September as part of a three-year agreement with Bectu.
Balloting began on Tuesday and will end on 30 August.
Two years ago staff held 13 strikes over their pay and the minimum wage was raised from £7.53 to £8.40 in January 2015 and then to £8.80 in September.
The London living wage has since gone up from £8.80 to £9.40 per hour.
Bectu said the company rejected offers to hold talks at the conciliation service Acas.
The union also wants Picturehouse to address issues about treatment of new staff, maternity and paternity leave, and night pay.
Bectu's assistant general secretary, Luke Crawley, said: "Bectu has tried to talk to Picturehouse but the company are being very hard faced in ignoring our pay claim.
"No one wants to go on strike and we would rather settle this by talking but the company has ignored our offer.
"Members need to vote yes and send a strong message to the company."
China has issued travel advice to its citizens travelling to Turkey after it said several tourists were attacked in protests over the Chinese government's treatment of ethnic Uighur Muslims.
[NEXT_CONCEPT]
Staff at a cinema are being balloted by a union calling for the London living wage to be paid.