Abstract: This paper discusses the general development of microhydroelectric generating unit in the farmer family uses, the development and utilization of microhydroelectric energy resources separated around the farmer and herdsman's houses and studies the designing of the low water-head, small flow capacity, microhydroelectric generating unit suitable for farmer family uses. It can largely ease the urgent requirements of agricultural energy resources, particularly the stressed situation of civil electricity used by the farmer and herdsman. It also provides the necessary and effective technical measures for altering the lagged behind features in the border areas. This also opens a new area for scientific research of agricultural hydroelectric energy resources - studying the microhydroelectric generating unit for farmer family use.Through many investigations this paper proposes the key technology of violently variations of voltages and frequencies following the changing of loading. This techno logy can be used for solving the problem existed during the process of electicity generated from the microhydroelectric equipments. This paper also states a research and development for the CALF series of microhydroelectric generating equipments in farmer family use, all of which are suitable for the installation conditions of ditch, pipe, shaft and dike type.It proves that, after checking the operation, this research provides the outstanding efficiencies of society and technical economy for developing and fully utilizing the small hydroelec tric energy resources widely spreaded over the farm villages and quickening the steps of agricultural electrification.