战时上海“第三国”势力主要指英美等国掌控的公共租界当局。太平洋战争爆发前 ,日方总的原则是 ,一切以争取对华战争的胜利为前提 ,在不发生正面的大规模冲突的前提下 ,尽量使英、美、法等第三国保持中立。同时 ,采取多种手段 ,逐渐削弱、排挤英美在上海的势力 ,最后达到其独占的目的。全面占领租界后 ,日方更是无所不用其极 ,疯狂侵占英美等国的经济利益 ,努力消除其政治影响。英美终战时 8年 ,虽时有妥协之举 ,但为了其自身的利益 ,为了不轻易放弃在华、尤其是在上海等地的势力和影响 ,未承认日伪上海市政府 The “third country” forces in Shanghai in the war mainly referred to the public concession authorities controlled by Britain, the United States and other countries. Before the outbreak of the Pacific War, the general principle of Japan was that on the premise of winning the victory over the war on China, all parties should try their best to make the third countries such as Britain, the United States and France maintain their neutrality on the premise of no major and large-scale clashes. At the same time, it has taken various measures to gradually weaken and crowd the Anglo-American forces in Shanghai and finally achieve their exclusive purpose. After the concession has been fully occupied, the Japanese side is using all its resources to the utmost extent, franticly occupying the economic interests of Britain and the United States and other countries and making efforts to eliminate its political influence. Although Britain and the United States ended the war with 8 years in the final battlefield, they did not recognize the influence of the forces of influence and influence in China, especially in Shanghai, for their own interests, and did not recognize the Shanghai Municipal Government