Anthropocentrism and ecocentrism are two ways of understanding an extension of ethics to nature. In an anthropocentric ethic, nature deserves moral consideration because how nature is treated affects humans. In an ecocentric ethic, nature deserves moral consideration because nature has intrinsic value. Ecocentrism focuses on the biotic community as whole and strives to maintain ecosystem composition and ecological processes. Anthropocentrism is the root cause of the ecological crisis, human over population, and the extinction of many non-human species. The understanding of the human-nature relationship affects strongly people's world views and differences in world views determine the way people conceptualise the need for addressing solutions to existing environmental problems. Developing Ecocentric attitude among secondary School students is a challenging task in the hands of teacher in the present society. Hence, the investigator made an attempt to develop Ecocentric Attitude among Secondary School Students by using two different Instructional Strategies, such as Co-operative Learning Strategy and Lecture Demonstration Method. It is an experimental study. Pretest-Post test parallel group design was used to select two Schools for the experimentation. The selected sample 80 were grouped into two and the instructional strategies used were Co-operative Learning strategy and Lecture Demonstration Method. Based on these selected two instructional strategies, the instructional package was developed for the IX Standard Environmental Science Content. The Ecocentric Attitude scale was developed and validated by the investigator and used to collect data. The findings of the study reveals that both the instructional strategies are effective in developing Ecocentric Attitude among Secondary School Students, but Cooperative Learning Strategy proved to be more effective than Lecture Demonstration Method in developing Ecocentric Attitude among Secondary School Students.