The purpose of this study intends to understand the current status of Internet Using Behavior for higher grade students in elementary schools at Taipei City, in addition, this study further explores the differences between variant backgrounds among their Internet Using Behavior, interpersonal relationship and academic achievement. This study uses well-designed questionnaires to gather information, and the participants were the students in ordinary classes of fifth and sixth grades in the public elementary schools during academic year of 2008 at Taipei City. Survey method adopted layered random sampling. Among the 12 administrative regions of Taipei City, two schools from each region were randomly selected. Then within the school selected, there was one class selected from both fifth and sixth grades, with a total of 48 classes and 1,363 participants were tested on the questionnaire. The total effectively returned surveys reached 1,247 copies with effective collection rate of 93.97%. The research tool used by this study was “Survey query for internet using behavior and interpersonal relationship for elementary school”. The collected information was analyzed and processed further with statistical methods like descriptive analysis, chi-square test, independent samples t test and one-way ANOVA. The major findings for this research are as follows: 1. The seniority as the internet users for the majority students in higher grades at Taipei City was over four years. The most common internet access occurred at home. From the perspective of Internet Using Behavior, 82% of the higher grade students spent two hours on average in daily online access, and the most frequently online activity for the higher grade students was in the category of entertainment, and learning category to the second. 2. Students of different gender from higher grade in elementary schools exhibited differently among “the daily average time spent online”, “online activities” as well as “interpersonal relationship”. 3. Students of different grades from higher grade in elementary schools exhibited differently among “online seniority”, “the daily average time spent online”, “online activities” and “interpersonal relationship” as well as “academic achievement”. 4. Higher-grade elementary school children with different "Internet sites surfed", "the daily average time spent online" and "the online activities" will have different performance in interpersonal relationships. 5. Higher-grade elementary school children with different "online seniority”, “Internet sites surfed", "the daily average time spent online" and "the online activities" will have different performance in academic achievement Conclusion was summarized from research findings, and it will be submitted along with concrete recommendations as references for education related organizations, teachers and parents who act in the capacities of prescribing educational policies, teaching and counseling.