The Sunway TaihuLight system was supported by the National High Technology Research and Development Program ("863"Program) of China. The supercomputer was developed by the National Research Center of Parallel Computer Engineering & Technology and it boasts the following outstanding performance: its peak performance is 125PFlops; its sustained Linpack performance is 93PFlops, and its performance per Watt is 6.05GFlops/W. All of these three key performance results are in the first rank in the world. To support both high performance computing and big data applications, the Sunway TaihuLight uses a high-scalable heterogeneous architecture, a high-density integration of the system, a high-efficient DC power supply, and other key technologies such as the customized water cooling system. The supercomputer is also equipped with high-efficient scheduling and management tools, a rich set of parallel programming languages and development environments, so as to support the research and development operations on the system. Sunway TaihuLight system is the world’s first supercomputer with peak performance over 100PFlops, and its CPU was designed by Shanghai High-Performance Integrated Circuit Design Center.