The purpose of this research is to produce the module prototype of teaching material on the Environmental Education course in Open University. This research used the formative evaluation technique, by developing, a prototype of module of teaching material on Human Being, Energy, and Natural Resource as a model in writing other modules. The module was tested and revised gradually, starting from one-to-one evaluation; the small group evaluation; and field evaluation. The result of the research shows that several deficiencies were found in the module prototype on the one-to-one evaluation, such as the less obvious picture with the description written in foreign language, formative test that is not suitable with the material, and some terms that are not clearly explained. The result of small group evaluation also shows that the material on module prototype is too excessive and there are some topics that must be revised. Meanwhile, the result of field test shows that the module prototype is quite good and it can be understood by respondents, but there are still suggestions related to the use of term that is not obvious. It can be concluded that the prototype of teaching material for Environmental Education is quite good to use as the teaching material for distance education after evaluation, revision, and field test, with a little bit the revision especially related to the use of term.