The blog provides the place of communication and sharing with the elementary school student teachers who practice teaching at diffinent schools. Using the blog to compose practice process provides the practice- guide organization with practice teachers' another guide channel.The researcher wants to understand how student teachers use the blogs. This study aims to explore the process and the impact of the use of blogs by 10 student teachers on' self-presentation and the internet learning community during one year student teaching practicum. Thus, the purposed of this study are: 1) to observe the self-presentation of blog use in the progress of student teaching, 2) to explore the culture of the internet learning community formed from the blogs of elementary school practice teachers, and 3) to explore the impact of blog writing on the self-presentation and the internet learning community for student teachers. This study uses qualitative research methods, including non-participant observation, interviews, and documentary reviews. After careful examination and analysis of the data collected, the following conclusions are reached: 1. The issue of trust and privacy of public blogs remains a challenge for the use of blogging in education. 2. Blogging helps to generate self-reflection. 3 . The main activity on the blog by the student teachers is journal writing instead of interacting with other student teacher peers. 4. The culture of the internet learning community in the blog environments for the participating student teachers is formal and serious. 5. Student teaching weblogs are not only a "performance stage" but also a "supportive community". The conclusions of this study would be served as suggestions and references for follow-up research. The suggested of this study are: 1) compare the student teacher use paper with blog to write daily record.2) the public of blog have the influence of student teachers.3) which is the factor obstructed student teacher interaction the discussion.