This paper introduces correlation techniques, functions and websites of an online supporting system for Japanese Composition; this is the first Google-based public system developed on the basis of CTLJ and several copyright-free natural language corpora. The online supporting system ranges over eight major functions, viz., personal profile, file system, sentence index, speech index, dictionary / translation, waiting list, spelling check, and administrator checking interface, all of which can be used in public except for the spelling check and administrator checking interface (http://corpora.flld.ncku.edu.tw/user/login.php). In particular, the dictionary / translation function includes seven optional features: Chinese-Japanese dictionary, Japanese-English dictionary, Japanese dictionary, translation, kana, Japanese pronunciation and Chinese pronunciation. The Google web toolkit specifically chosen as a devkit in constructing the system, will make it easy for users to access various sources and corpora without downloading any software. We hope that the system should be actively utilized and contribute to teaching resource sharing.