Due to the climatic feature of strong solar radiation and large daily temperature difference in Tibet, China, traditional residential buildings mainly have the characteristics of large north-south depth and thick walls. This design method reduces the direct solar radiation effectively, however, it leads to several lighting problems, i.e. insufficient natural lighting, and weak light comfort, etc. To overcome design defect of the traditional window and taking climatic feature and regional characteristics in consideration, a feasible multifunctional window system was proposed and analyzed. The novel system is mainly composed of photovoltaic power generation panel, reflective panel, thermal insulation panel, and rotating shaft. For evaluating the proposed multifunctional window performance, a theoretical model was established in 3 operational patterns: summer, winter, and transitional season, and field tests were conducted for verifying the data accuracy. The results shown that, compared with traditional window of the same size, multifunctional window increases southern indoor natural lighting depth by 5 times for 10 hours in the transition season, increases the lighting depth by 2.5 times(above 7.5m) for 9 hours in winter, and increases daylight factor by 0.5% in summer; the average monthly power generation of photovoltaic power generation panel in summer is 9kW·h, and the annual photovoltaic power generation reaches up to 90kW·h. And multifunctional window increases the temperature difference between the inner and outer surfaces of window in winter and summer by about 3-8℃ and 2-4℃ respectively, reduces the temperature difference between the inner surface of the window and wall by about 2-4℃ in winter, and the inner surface temperature of the window is closer to the indoor temperature. Overall, the multifunctional window has the characteristics of low cost, diverse functions, remarkable effect and strong economic competitiveness. It is of important significance in other advanced window design and practical application.