Abstract: During the 20th century, Japanese scholars made significant contributions to the study of Tang Dynasty poetry with a total of 2676 research achievements. These achievements can be divided into the pre-war and the post-war periods, with the end of World War II in 1945 serving as the turning point. The post-war period can be further divided into two stages: 1946—1978 and 1979—2000, with the opening up of China in 1978 being a significant shift. While the quantity of research achievements in Japanese Tang poetry studies before 1945 was generally low (even nothing recorded in certain years), there were notable scholars like Suzuki Torao and Toyota Tsuguru who made a profound impact and paved the way for subsequent researchers such as Yoshikawa Kojiro and Matsuura Tomohisa. This initial phase of research primarily focused on the exploration of Bai Juyi's poetry and can be seen as the pioneering stage for Japanese scholars in the field of Tang Dynasty poetry studies. After 1945, the quantity of research achievements gradually increased, accompanied by a growing number of scholars participating in this field. Post-war Japanese scholars, spearheaded by notable figures like Yoshikawa Kojiro and Matsuura Tomohisa, have made significant contributions to the study of Tang Dynasty poetry, yielding fruitful results in their research endeavors. Following China's reform and opening up in 1978, research on Tang Dynasty poetry in China experienced a rapid rise, establishing itself as a major force in the global field of Tang Dynasty poetry studies. In contrast, the influence of Japanese scholars in this field has declined.