Research on Uijeok’s thought was initiated by Japanese scholars who had studied Japanese medieval pure land beliefs. In scrutinizing the Japanese pure land literature, they found not a little citations of Uijeok’s Commenatry on Amitabha Sutra were shown in the literatures. They edited collections of the citations and started to study Uijeok’s understanding on the pure land belief. During the late of sixties and early seventies other Japanese scholars who studied Yogacara thoughts and Buddhist Commandments also found that Uijeok’s other books, such as the Explanations on Mahayana theories and Commentary on Indra’s net Sutra, had given not a little influence on Japanese Buddhism and started to examine them. In Korea, from sixties to eighties when some scholars tried to systemize Shilla Buddhist thoughts, his Commentary on Amitabha Sutra and Commentary on Indra’s net Sutra were scrutinized and his thoughts on pure land belief and Buddhist Commandments were compared with those of other Shilla monks such as Wonhyo, Taehyeon and Gyeongheung. And some scholars who examined his works and some fragmentary records on his life argued that he had been much more a famous Yogacara scholar than a Huayan monk, though some records tells that he was a disciple of Uisang, the founder of Korean Huayan school. During the same period another work of Uijeok, the Compilations of Miraculous records related to Lotus Sutra, was found in Japan. Since the nineties the studies on Uijeok’s thoughts have developed much more. Some scholars scrutinized the citations of his the Explanations on Mahayana theories, the minute cathchism on Yogacara philosophy, remained in some Japanese literatures. They found out that his Yogacara thought had some peculiarities in some important aspects and different from that of Chinese Yoagcara scholars. Others examined the contents and philosophical and historical background of his works on Lotus Sutra, the Commentary on Lotus Sutra Sastra and Compilations of Miraculous records related to Lotus Sutra, and compated them to the similar contemporary Chinese works. Through these, Uijeok came to be recognized as a great scholar whose interests covering not only the pure land belief and Commandment thoughts but also the Yogacara philosophy and Lotus Sutra. Now he was regarded one of the great Buddhist generalist of Shilla. Despite of these recent developments, most of the studies on Uijeok’s thoughts dealt only one aspect of his thoughts and failed to examine Uijeok’s thoughts comprehensively. There have been no trial to compare and synthesize all of his works. In this sense the research on Uijeok’s thoughts can be said to be still in the rudimentary level. Now the studies trying to synthesize and characterize his thoughts by comparing all of his works are needed.