Creativity is one of the skills in the core subject of the 21st century. Thinking skills are related to language development. Language mastery can be obtained through reading. Reading involves the brain to think in understanding the contents of a reading. The more often you read, the more your students' thinking skills will be sharpened. With the knowledge that is owned will make students able to create new ideas. This study aims to analyze the impact of pre-lesson reading activities on students' creative thinking skills. The research approach used is a qualitative case study of single case study with the research subject of fifth-grade students of the Karangduwur 1 elementary school. Data collection techniques in the form of observation, interviews, and documentation. The data analysis technique used is using the flow analysis model. The results of the study stated that reading before the lesson is a form of initial literacy by getting students to read for 15 minutes before the lesson begins with various types of reading. Reading activities before lessons have an impact on several indicators in students' creative thinking skills, namely fluency 67%, 29% originality, 44% elaboration, 56% flexibility. This study concludes that reading activities before the lessons carried out continuously have an impact on students' creative thinking skills, especially in fluency.