In this paper,the methods used to prepare future weather data for the study of the impact of climate change are reviewed. This includes the extrapolating statistic method,the imposed offset method,the stochastic weather model and global climate models. The advantages and disadvantages of each method are discussed. The relationship between these four methods are also been illustrated. Then it focuses on the theory and calculation about the morphing method and uses the historical observation data and the IPCC scaled monthly forecast data to produce the year 2050 hourly meteorological data in Xi ' an; The application of Energy Plus is utilized to simulate the residential and office building energy consumption. The fine meteorological data for building energy simulation is the basis for the future work of building energy efficiency design and sustainable development.