The purpose of this thesis work is that to design a stand-alone PV village system in Tibet substituting the old diesel generator to supply electrical loads for Xiangmao village. According to the particularity of Tibet, which is alleged as the highest elevation of the third pole in the world, on the foundation of the investigation for the local region. The method is computer-aided program and parametric analysis on the basis of the local systematical examination and to explore feasibility of the economy and the technology of Tibet PV village system. The work has started from the solar radiation collection for the local data almost 20 years ago, the statistics to the available electrical load of this village and the forecasting coming 3 years load. Theough the collation and calculation to solar radiation data from Naqu radiation station that had complete solar data of 14 years and author determined the optimum tilt angle of array in this PV village and the mean daily each month radiation quantity. By means of this computed results author counted and selected out the capacity of PV array and battery, their optimum combination point and completed optimization of the PV system. As a result, through analysis of the state–of-charge for battery, the PV system parameter becomes more perfect. Finally, the analysis of the technology and economy of the PV village investments is accomplished by means of the renewable energy knowledge.