大钦茂是渤海国第三代王。其统治时期渤海国政治经济文化全面发展,并积极与唐王朝及周边国家和部族发展关系。本文试图对大钦茂时期渤海国与唐王朝及日本交往的史实进行分析,来探求渤海“朝唐聘日”观的形成。 Dacheng Mao is the third generation of King Bohai Sea. During its reign, the Bohai State comprehensively developed its political economy and culture and actively developed relations with the Tang Dynasty and its neighboring countries and tribes. This article attempts to analyze the historical facts about the contacts between the Bohai Sea Kingdom and the Tang Dynasty and Japan during the Taisin-Mao period in order to explore the formation of Bohai Sea.