During the initial time of the war, the main battlefield transferred from North China to Shanghai, for North China was losing great relevance. During this period, Xu Yongchang, the director in ShiJiazhuang behalf of ChiangKaishek, played a considerable role. Scholars in the past payed more attention to the strategy and personnel, while ignoring the importance of Xu Yongchang. Making Xu Yongchang as the clue, this article studied the change before and after. And all the facts are precisely the projection of war. Xu Yongchang and the war in North China reflected the actions and shortcomings of the Nationalism government in the strategy, internal personnel and preparations for the war. Therefore, the war situation in North China can be regarded as a miniature of the political situation before the national government in a certain extent.