This study attempts to explore Taiwan's higher education students' needs and motivations for building their own E-Portfolio via blog service. To examine university students' behavioral intention, this study employed the Theory of Planned Behavior (TPB) as the research framework. One hundred and ninety-two participants completed a survey questionnaire measuring their responses to four constructs in the TPB. The results show students agree that using blog can promote more the interactions between both teacher and students and peers. To motivate students to building e-portfolio via blog, we need to explore the needs from user's perspectives. Such as the function of priority setting, privacy, self design space, and as an access to get job or school.