There are already many researches about Jianzhen’s arrival in Japan. Therefore, this paper described his motives for going to Japan as being related to Taoism in the Tang era. Early return of Japanese dispatched priests and Jianzhen and the others’ obsessive passion for going to Japan is due to the Chinese circumstances which prosperity of Taoism reached its peak in the period of Xuanzong, and as well as Japanese circumstances, “Japanese emperor did not worship principles of Taoist priest”. There were no evidence that Tang era’s Taoism were taken into Japan, as a religious community which had facilities, officers, and organizations; however, Taoism among the Tang cultural things which are mixed into rituals, folk beliefs, and annual events would be brought to Japan by various routes in the era of Japanese envoy to the Tang Dynasty.
