In addition, Kangen restructured Shingon sect, based in To-ji Temple, by storing in the Kyozo (sutra repository) the 'Sanjujo Sasshi' (30 volumes of esoteric Buddhist scripture hand-copied by priest Kukai when he was staying in China) brought back by Kukai from Tang Dynasty, and determining that the volumes should be looked after by choja of Shingon sect generations after generation.
ほか、空海が唐から請来した「三十帖冊子」を東寺の経蔵に納めて以後代々の真言宗長者の相承とするなど、東寺を中心として真言宗の再編を行った。