This study was focused on the system of regional resource circulation(RRC) of Asan-Si as a case region. So 301 farmers(members of producer organization) who are managing environmental-friendly agriculture(EFA) are surveyed. The RRC system is focused on establishing the system of regional complex farming connected with the seedling farming and the livestock. The main results surveyed are as follows : First, total cultivated acreage is 574ha. Second, the total quantity of by-products of rices, beans, wheats is 983M/T. Third, the total quantity of nutrient requirement for seedling farming is 85,335.6kg This research shows how to develop the RRC system for EFA. The development model and strategies are as follows : The first model for the system of regional resource circulation can be called the scenario of the best output for the system of environmentally friendly resource circulation. It is considered to estimate the appropriate number of heads of Korean cattle and hen which can be bred simultaneously. And the second model can be called the scenario of the regional allotment for the appropriate number of heads of those. It is considered to estimate the appropriate number of heads of those which can be alloted by the individual farm or area.

How to plan the energy system is one of the keys for constructing the Environment -Friendly City. For this reason, a great number of surveys for utilizing unused energy have conducted by a planner. In regard to unused energy, the heat from incineration plants classify as a unused energy having high-exergy-energy. From this point of view, It is studied about the plant systems providing heat to district heating & cooling(D.H.C) and producing electric power. It is divided four system models as system I (10K [kgf/cm2] vapor as outlet of boiler, supply for 10K vapor and return to 60℃ as supply condition of district heating), system Ⅱ (30 K vapor as outlet of boiler, supply for 5K vapor and return to 60℃ as supply condition of district heating), system Ⅲ (30 K vapor as outlet of boiler, supply for 85℃ hot water and return to 60℃ as supply condition of district heating), system Ⅳ (30 K vapor as outlet of boiler, supply for 47℃ hot water and return to 40℃ as supply condition of district heating). The results from the upper condition of four system, System Ⅱ got a proper on economical benefits and system Ⅳ calculated as benefiting on energy saving effects, and suggest indifference curve as the total evaluation method of both economical benefits and energy saving.