This research is motivated by lack of teacher’s references which consist the computational thinking practice activity book for children. The aims of the study was to discover 1) development an activity book based computational thinking to Pelajar Pancasila topic for children aged 9-12 years, 2) recognized the plan design quality according to computational thinking indicator and 3) recognized the quality of an activity book based on computational thinking to Pelajar Pancasila topic for children aged 9-12 years. The research methodology used for this study is Research and Development (R&D). Subject of this research is thirty one students were involved in the activity book product trial. The result of the study are as follows, 1) development an activity book based on computational thinking to Pelajar Pancasila topic for children aged 9-12 years using ADDIE steps, including Analyze, Design, Develop, Implement, and Evaluate. 2) The quality plan activities design is fulfill the four cornerstone of computational thinking which is decomposing, pattern recognition, abstraction, and algorithms. 3) The quality of an activity book based on computational thinking to Pelajar Pancasila topic based on the result of validation by 2 computational thinking expert and 1 teacher with a scale of 1-4 the overall is “very good” with a score of 3.277 with a recommendation “need a tiny revision”. The result of the limited trial based on the reflection sheet showed that 63% children felt happy, art festival activity consider as the most easiest by 32% children, although 38% of children consider the most hardest activity is decorating stage. Thus, it can be concluded that the activity book has very good quality.