This study investigated the importance and enforceability of constitutive factors of community-based environmental learning centers. Literature review and expert interviews were first conducted to understand the meaning of main factors and sub-factors. Then the constitutive factors of community-based environmental learning centers were established by a Delphi expert panel of 12 members. The following results were obtained. The four main constitutive factors of community-based environmental learning centers were “community resource facilities”, “personnel”, “programs” and “operation management”. These four main factors comprised 19 sub-factors. The “personnel” factor was the initiating factor of community-based environmental learning centers. It was also the most important, followed by “community resource facilities”and “program” with “operation management” being the last main factor. The importance and enforceability of constitutive factors of community-based environmental learning centers were examined using comprehensive analysis. Sub-factor 12(environmental education program) and sub-factor 14(interpretation and training program) should first be planned and promoted. Sub-factors 4(industry resource), 5(operating facilities and transportation conveniences), 15(planning and marketing outreach program) and 18(field management and maintenance) can be promoted at a later stage when the center is almost established.