Abstract: Reflecting after fifty years on Japan’s large-scale invasion of China from the Sino-Japanese War to the 1945 War in the Pacific.It is clear that the Sino-Japanese War greatly influenced the history of the two countries。This essay argues first of all that the Sino-Japanese War caused China great hardship and humiliation ,while also promoting the awakening of the Chinese people。Secondly,the war stimulated the unlimited expansion of the aggressive ambitions of the Japanese imperialists so that from this time on they pursued staunch policies of imperial expansion.Thirdly,the war completely altered the originally equal relationship between Japan and China,placing Japan in the ranks of imperial aggressors.Fourthly,the war destroyed the existing political system in the Far East touching off a long-term struggle among the big powers for influence in the region.