This study aims to develop an interactive electronic school book on blackbody radiation LCDS- based that are valid as self instructional materials to foster students' critical thinking skills. The method used is research and development. The stages of this research are the existing potentials and problems found, information gathering, product design, product validation, final revision of product, and legibility tests and ease of operation. This research instrument is questionnaire. Interactive electronic school book have supporting content that is, user manual, user learning process, video, animation, simulations, and interactive tests. Expert test for product consist of content validation with score 3,36 (very appropriate) and design validation with score 3,45 (very appropriate). Readability of interactive electronic school book on blackbody radiation LCDS- based got score 3,23 with good quality. Ease operated interactive electronic school books on black radiation got a score of 3.28 which means it can be operated independently.