In this paper, we introduce a Web based self-directed learning environment using a student's Web-annotation and describe the evaluation of our system. SDL (self-directed-learning) is one of the teaching methods that supports the autonomous learning of the learner. However, it is difficult for the learners to choose a web page suitable for their learning purpose as the learning resource in the web based SDL. We developed a prototype system that is called "Retracer". Our environment recommends the web pages and information that it is useful for the learner using the learner's annotation. This method analyzes the feature of a Web page, and extracts the learning resource suitable for a student need using a Web-annotation. Finally, we got the good result in a trial use.