After the incident on July 7,1937,the Japanese blockaded the coastal region of southeastern China.And the Yunnan-Vietnam railway became the main transportation network of International Aid Projects for China.According to the prewar negotiated agreement between Sino-French,China owned the right to send the materials via Yunnan-Vietnam railway.However,in front of the despotic power of Japanese Fascist,French considered the interests in the Far East and ignored the transportation of China railway via Yunnan-Vi...