The research aimed to identify the effectiveness of teaching the mechanics curriculum using practical experiments in developing strategic competence and design thinking among STEM school students. It was applied on a group consisted of (40) first year secondary school students, that was divided into (21) experimental group students and (19) students as a control group, A number of materials and tools were provided, including a list of design thinking skills, strategic competence,  student's book containing the lessons of the mechanics syllabus scheduled for first-year secondary school students in the first semester after reformulating it according to practical experiments, teacher's guide for teaching the mechanics course using practical experiments, and the research tools, design thinking test, design thinking scale, and the strategic competence test, The results of the research revealed the effectiveness of practical experiments in developing design thinking and strategic competence among first-year secondary school students in STEM schools.