宁案,即1927年3月24日国民革命军攻占南京时发生的中国军民骚扰外国人及由此引起的英美军舰炮击南京事件。宁案牵涉中英美日法意六国,解决过程经历武汉、南京国民政府两个时期。本文试图通过对中外宁案交涉过程的回顾,揭示大革命前后中美外交轨迹。一、宁案前后美国的对华政策 The Ning case, the Chinese military and civilian harassment of foreigners and the resulting British-U.S. military-gun-mortar attacks on Nanjing on March 24, 1927, when the National Revolutionary Army occupied Nanjing. The case of Ning involved the six countries of France, Britain, the United States, Japan and France. The process of settling the dispute was under the two periods of Wuhan and Nanjing National Government. This article attempts to reveal the diplomatic track of Sino-U.S. Diplomacy before and after the Great Revolution by reviewing the negotiation process of Ning-Ning case. First, the Ningxia policy before and after the United States toward China