The research was conducted on the basis of skills that must be mastered by students still limited to the low-level thinking. It was because the learning process conducted not to develop and to improve the skill of solving the problem. Therefore, researcher wanted to improve the quality of learning by applying social inquiry learning model. The purpose of this study were to describe the activities of teachers and students in learning process, to describe the development in the social problem-solving skills of students, and to develop students’ response to the learning process.The method of the research was class action research through four recycle stages, namely planning of class action, implementation of class action learning, observation, and reflection. Subject and location of the research was students of class V A SDN Jeruk 2 Surabaya consisting of 25 students. The instruments were the observation sheet, test and questionnaire sheet. The data analysis technique was quantitative and qualitative description. This research was conducted for three cycles. The result was obtained from the analysis of the data showed that the activity of teachers in the cycle I 90 %, the cycle II 93 %, and the cycle III 97%. The activitiy of students in the cycle I 75,8 %, the cycle II 91 %, and the cycle III 95%. For the improvement of social problem-solving skills of students in the cycle I 78 %, the cycle II 87,5 %, and the cycle III 93 %. The response of students to the learning process showed good results, students could easily understand the lesson. The conclusion of the research was that the social inquiry learning model could improve social problem-solving skills. It was proven when students could solve the social problems, students' skill is progressive in each cycle. The results of this research could be the reference and the alternative learning of social studies.