China will set up a special database and upgrade the protection of documents regarding the Nanjing Massacre after files relating to the atrocities were listed in UNESCO's Memory of the World Register.

A number of domestic archives will jointly establish the database, which will be open to the public at home and abroad, a source with the Second Historical Archives of China, who asked not to be named, said on Sunday.

The database can help people learn more about the historical calamity caused by the war, the source said.