China appears unimpressed that Australia and Japan are set to sign a defence pact for military visits.

The agreement will make it easier for Australia, Japan and the US to conduct military exercises together on Japanese soil.

The agreement sets out the legal status for military personnel visits.

A spokeswoman for the Chinese Embassy in Canberra said China was aware of the reports about the agreement being signed.

"This is a bilateral issue between Japan and Australia," she said.

"At the same time, China believes that the military cooperation among the countries concerned should not undermine the security interests of other countries or affect the regional peace and stability."

Japan and Australia have been negotiating an agreement since 2014.