The instilling of national character value may be achieved through learning. Therefore, this study aims to create a Lesson Plan, which integrates the characters of curiosity and responsibility with a scientific approach and to determine product validity. Research and Development (R&D) was used as a model for conducting this study. The Research and Development used Borg and Gall model. Furthermore, the characteristics of the developed lesson Plan were evident in the syntax/learning steps, which were organized according to curiosity indicators and responsibility characters. This study involved 2 expert validators and 1 school practitioner. The instrument used was a learning plan validation sheet. The results showed that the Lesson Plan with a scientific approach may be used to develop the character of curiosity and responsibility for students in junior high school. This can be seen from the validity of three aspects which is the format (100%), language (98,33%) and content (97,47%) which are very good qualification. It can be concluded that the lesson plan developed is valid and able to building curiosity and responsibility character student.