The current study aims to investigate the effectiveness of a proposed unit Psychology course based on social constructivism the theory of Vygotsky for developing environmental concepts and attitudes for grade two secondary stage students. The study applied procedures on a sample included 70 students from the second grade secondary students (literary section), ranging from an average age of 15.5 years old. It has applied achievement test environmental concepts (by the researcher), and the proposed unit (by the researcher), a measure of environmental trends (by the researcher). The study findings: There is statistically significant differences between the two measurements pre and post test for grades three types (remembering- understanding- application) in favor of (post) the dimensional application. There is no statistically significant differences between the two measurements pre and post to measure environmental attitudes in favor of (post) the dimensional application. There is no statistically significant difference between the two measurements Posttest and iterative test grades three types (remembering, understanding, application). There is no statistically significant difference between the two measurements and dimensional iterative to measure environmental attitudes.