The deputy head of a war museum in Shenyang said a declaration in 1931 against Japan's invasion demonstrated Chinese people's determination in fighting the war.

This year marks the 80th anniversary of the victory of the Chinese People's War of Resistance Against Japanese Aggression and the World Anti-Fascist War.

The declaration was made a day after the September 18 Incident in 1931 marking the start of Japan's invasion of China.

"The September 19 declaration was the first declaration of war against Japan issued by the Communist Party of China," Zhang Lu, deputy director of the Memorial Hall of the Former Site of the CPC's Manchuria Provincial Committee, told Hong Kong reporters touring Shenyang.

"It announced our political stance of resolute resistance against Japan and declared the Chinese people's strong determination to fight the Japanese invaders to the end."

Zhang said the committee organised anti-Japanese armed forces in northeast China in support of nationwide resistance.

In addition to the declaration, clothing, supplies and historical photographs of the troops are among the items on display.

The memorial hall also features simulated guerrilla warfare.