This study aims to know the feasibility level, students response and students understanding level toword mind mapping based chemistry pocket book of salt hydrolysis material class XI MIPA SMAN 1 Bengkulu Tengah middle school year 2018/2019. This study is a depvelopment research, the development style that osed in this study is 4D with 3D stages limitation (define, design, and development). The data of this study were collected from interview result, questionnaire that was validated by expert of media and material, students response in small and large scale trials, and students understanding test. This research was conducted on January 1 to February 27, the result of this study shows that the developing mind mapping based chemistry pocket book is categorized as a very feasible. Based on expert validation, this developing mind mapping based chemistry pocket book gets 93.6% for material avarage score, and 88.3% for media avarage score. The product trial in small scale from 9 students, obtains an avarage percentage of 92.8% in the criteria of very interesting. The product trial in large scale from 30 students obtains an avarage percentage of 90.7% in the criteria of very interesting. In the students understanding test toward this chemistry pocket book, the percentage that obtained is 80% in the criteria of good. The result of this study shows that the mind mapping based chemistry pocket book that was developed is feasible for being used as a chemistry learning sources in salt hydrolysis learning material.