The purpose of this study is to probe students' ecological literacy level (knowledge, caring, practical competency and concern) and to identify the impact socio-demographic dimension has on the students' ecological level. This study was conducted with 120 students belonging to Houman Elftouaki high school in Tendrara/town. To collect data, we made use of one data collection method which id questionnaire. The finding revealed that students' ecological level is very limited and there is an impact of socio-demographic dimension on this level. By emphasizing, we hope that this piece of work will contribute to the improvement of student's ecological literacy level in Moroccan high school.