This study is to examine whether elementary science textbooks in Korea and Singapore are applicable to flipped learning. By comparative study we sought to identifying appropriate features of science textbooks for learner-centered teaching. We analyzed text pages on the unit of `Working of electricity` in Korean elementary science textbook for sixth grade and three chapters of `Electric circuits, Using electricity, Conductors of electricity` in Singaporean elementary textbook, `Science : My pals are here!`. We designed evaluating frameworks for science textbooks based on the four pillars of flipped learning. and applied it to 10 elementary teachers evaluate two textbooks. They evaluated textbooks with Likert Scale items and wrote detailed statements and exemplars about their choices. We analyzed the teachers` evaluative descriptions inductively and chose commonly mentioned characteristics. Based on the analysis, we got to the conclusion about specific features of two elementary science textbooks in terms of flexible environment, learning culture, intentional contents, and teachers` expertises. Implications for improving science textbooks towards flipped learning and learner-centered teaching through comparative study were discussed.