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Critical thinking skills is the one of skills required by students in facing the real word problems in 21st century era. The purpose of the research is analyzing the effectiveness of the use e-books-oriented critical thinking skills by using multiple representation. The research method used in this study is a quantitative method with a type of quasi-experimental research design. The research design used was a pre-test / post-test control group design. Effectiveness is determined by the hypothesis test and effect size. The statistical testing showed that there was a significant difference on the aspects of critical thinking skills between class that uses Android-based e-books using multiple representation and the class that uses the standard e-books. Where as based on the size of the impact it has the value of the very large categorical effect size. The result showed that Android-based e-books developed with multiple representation is effective to improve students- critical thinking skills.