This paper explored how the use of weblogs within the portfolio framework affected portfolio production and development for student teachers, and how the weblog-based electronic portfolio (WBEP) shaped student teachers' reflective practice during the student teaching practicum. The individuals participating in this study consisted of 31 elementary school student teachers from a national university's teacher education program in Taiwan. Qualitative data analysis revealed that about half the participants' WBEP maturation level were at Level 2, the Curriculum Vitae WBEP. The two most prominent features of the WBEP platform on participants' reflective practice were personal editorship and dialogues with others. Additionally, blog publicity promoted mandated dossier-like portfolios with which to evaluate performance with respect to external evaluation requirements. Thus, the reflective themes of most WBEP contents were rather uniform in the study.