The aim of the current research is to develop the Core thinking skills and environmental security among students of the scientific divisions at the College of Education, and to achieve the goal a program in social scientific issues based on the Systems Thinking Approach was proposed. In the light of this, a research group consisting of (93) A student from my division (Chemistry-Physics) in the fourth division at the College of Education-University of Zagaziq - first semester of the university year 2023-2024, The research tools were (Core thinking skills test, environmental security measure), and the research used the experimental curriculum and the semi-experimental one-set design where the two research tools were applied to the group before, Then the proposed program was presented to the group, after the completion of the research tools were applied dimensionally, The results indicated that the students of the research group excelled in the Post application about the Pre application by a statistically significant difference at the level of (0.01) in the Core thinking skills as a whole and in each skill separately, and in the dimensions of environmental security as a whole and in each dimension separately., the findings also found the effectiveness of the proposed programme in developing Core thinking skills and environmental security, and a positive correlation between the research group's students' scores in testing Core thinking skills and their grades in the environmental security scale, and the research presented its recommendations and proposals in the light of the findings.