The purpose of this research is problematology of using new technologies in the stages of blended learning and education, which was conducted with a qualitative research approach and a case study method.The field of this study included all teachers and students of the first and second secondary schools in Tehran who had direct experience of participating in the blended learning process. To collect the findings, 21 teachers and 7 high school students in Tehran schools were purposively selected as samples and semi-structured interviews were conducted with them. It should be noted that after studying this number, theoretical saturation was achieved and Brown and Clark's thematic analysis method (six steps) was conducted with the help of MAXQDA 2020.The categorized issues of the application of modern technology in the stages of learning and teaching were categorized from the perspective of teachers into 5 comprehensive components: "1. Weakness of the motivational system, 2. Changes in social relations and values, 3. Technical and infrastructure challenges, 4. Weakness of supervision, and 5. Issues related to budget and financial affairs" and the issues from the perspective of students were categorized into 4 comprehensive components: "1. Motivational limitations, 2. Self-management, 3. Teachers' professional skills, 4. Failure to maintain academic privacy."Based on the research findings, it seems that effective implementation of blended learning requires simultaneous attention to management platforms, participatory culture, and educational infrastructure.