China said its military was carrying out armed patrols near the Myanmar border this week, with Beijing concerned about the potential fallout from a civil war on the other side.

Troops were deployed to Yunnan Province on Monday to test their ability to maintain security in border areas, the military’s Southern Theatre Command said.

An alliance of ethnic militias has dealt a series of setbacks to Myanmar's military in the country's northeast, which is near China.

Five people were injured on the Chinese side in January by a stray artillery shell.

Live-fire drills would be held from Tuesday to Thursday in four locations including two in Ruili city, the Yunnan government said.

The units will carry out armed patrols and joint air-ground patrols to test their ability to mobilise quickly, block and control and strike together, the southern command said in a statement.

The military previously held live-fire drills near the Myanmar border in November.

Foreign Minister Wang Yi said earlier this month that China “opposes chaos and war in Myanmar," according to state media.

Beijing helped broker a cease-fire in Myanmar back in January, but that fell apart in June when one member of the Three Brotherhood Alliance launched new attacks.

The Chinese Embassy in Myanmar issued a reminder this month to citizens in Shan State to strengthen their security precautions and stay away from conflict zones or return to China. (AP)