南岛路航线的开辟是遣唐使航海线路变更的一种新尝试,其开辟的原因与日本国内引进大陆先进律令制度的需求、国内对外气运的高涨、东亚政局变动等国内外情况息息相关。 The opening of the South Island route is a new attempt to send Tang to change the navigation route. The reasons for the opening up are closely related to the domestic and foreign situations such as the demand of introducing advanced legal systems in the Mainland, the upsurge of domestic and foreign air transportation, the change of political situation in East Asia, and other places.