Cracking in high concrete dam is a common problem. Many concrete dams in China and abroad are forced to shut down due to cracks in construction. The process of pouring high concrete dam is affected by natural environment, structure, temperature control, resources and other factors. It is necessary to develop a practical plan of dam construction by considering these factors. Real time monitoring and scientific management of concrete temperature and stress during construction are also requisite. Research and development of decision support system for concrete dam construction can provide advanced management approach for the construction and safety of hydroelectric dams, and potential benefits will be huge. With the project of Lizhou hydropower station as research background, a temperature control decision support platform for high RCC arch dam is developed. Through this platform, data information such as rolling parameters, temperature control information, monitoring data and simulation results are efficiently managed. Moreover, the effect and trend of temperature control are realtime monitored and predicted, earlywarning is accomplished and decisionsupport from experts remote consultation is provided. These results are of important significance for promoting the scientific level of construction temperature control decision support for high RCC arch dam and ensuring the construction quality.