Thi spaper reviewed the development of the thought of sustainable development and the theory of ecology and analyzed the change of energy value in the agro-ecosy stem of Dezhou City between 1998 and 2007 and the sustainability of the agro-ecosy stem .Results showed that the total energ y usage of agro-eco system of Dezhou City kept increasing during the study period , so did its dependence on non-renew able resources .Its enviro nmental loading ratio kept grow ing and its sustainable development was under g reat pressure .The agro-ecosy stem manag ement in the future should develop water-saving irrigation , int roduce advanced technology actively , increase the input of energy value of intellectual resources , adjust the input of indust rial supporting energy to improve the benefit ratio of energy value , and explore the ways of establishing a multi-level and high-function ecological agriculture .