CHENGDU, July 27  -- The privately run Jianchuan Museum in southwestern China's Sichuan Province announced on Sunday it will display more than 400 pieces of evidence documenting Japan's invasion during World War II.

The evidence includes letters of Japanese soldiers, official documents during the bombings, propaganda pictorials boasting of military achievements, shell debris and Japanese officers' swords, according to a press conference at the museum in Anren Township, Dayi County.

The evidence will be displayed in a new exhibition hall built specifically to display materials relating to Japanese atrocities during WWII.

The 3,500-square-meter hall will officially open on Sept. 3, the 70th anniversary of China's victory in the anti-Japanese war. It was designed free of charge by Arata Isozaki, a renowned Japanese architect.

Jianchuan Museum, established by entrepreneur Fan Jianchuan, opened to the public in 2005. It is one of the largest private museums in China with about 30 exhibition halls focusing on the anti-Japanese war, folk customs and earthquakes.