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The purpose of this research was to develop learning materials of natural science of characters-based problem on light and optical concept in junior high school Four East Praya. Method of the research is descriptive, evaluative, and experimental. Research and development study refering to Dick & Carey design namely: identify instructional goal, conduct instructional analysis, analyze learner and contexts, write performance objektives, develop assessment, develop intrucsional strategy, develop and select instructional material, design and conduct formative evaluation of instruction, revise instruction, design and conduct summative evaluation. The formative evaluation stage was done by: the validation of the learning materials by three experts, the limited trials on the learning materials of natural science and teaching tools (syllabus, lesson plan, and students worksheets) held in eighth grade, and validity and reliability test instruments (critical thinking skill tests, scientific attitude, and character questionnaire) held in ninth grade. The expert test results showed that learning materials of natural science were feasible, teaching tools very feasible for use in limited trials. In conclusion, learning materials of natural science of characters-based problem on light and optical concept was feasible to be applied in science learning processes.