We present an energy-flow model for rural family farming systems (RFFS) in LDCs such as Bangladesh. This model incorporates farming components acting as sources or sinks of energy flows in providing edible, saleable and inflammable output for sustaining the rural physical quality of life (PQL). Based on this model, the quantitative input-output structures for different energetics, as well as energy flows for the farming system of a traditional village in Bangladesh, are presented. This system is evaluated in terms Of energy-dependent indicators.