This paper reports on the website "Nihongoon Kikiwake Renshuu" developed to assist Japanese learners to acquire Japanese phoneme, especially by those who find it difficult to acquire due to the influence of their mother tongue. This e-learning site was designed for Japanese learners with Chinese dialogues to acquire /n/, /r/ and /d/ which are generally considered difficult. It consists of three parts, "Self-diagnosis test", "Practice" and "Self-reflection". It was found that Japanese learners using the site were able to grasp the problem and understanding through various self-reflections. This study proposes the autonomous study method by using this e-learning site and how teachers should assist.