People flying to China must show the results of a test that indicates they are not infected with the coronavirus before boarding the plane.
The Chinese aviation authorities said this on Tuesday. The test should be no more than five days old.
The institution taking the test should be deemed suitable for this by the Chinese embassy in the country.
In many countries, authorities are struggling with available tests and in some countries, getting the test results to take two weeks.
More and more airlines are flying back to China and expanding the number of flights with permission from Beijing, including Air France-KLM.