Achieving carbon emission peak by 2030 and carbon neutrality by 2060 is a major national strategic decision，which is an inherent requirement to promote high-quality development and may drive systematic revolutions in the economy and society. To achieve emission peak and carbon neutrality，it is necessary to depend on the basic domestic conditions that coal is the main source of energy，make efficient use of existing coal-fired electric power generation units，increase the capacity of new energy consumption，and promote the optimization and upgrading of industry，transportation，construction and other major carbon-emitting industries，and adopt more green and low-carbon technologies. The deep integration of information technology with various economic and social fields，represented by the Internet，Big Data，Artificial Intelligence，Internet of Things，Cloud Computing and fifth-generation （5G） mobile communication technologies has accelerated the digital transformation and upgrading in various fields，and played a significant role in achieving carbon emission peak and carbon neutrality in China as scheduled. In this paper，the role and path of information technology applications in promoting carbon emission peak and carbon neutrality in the energy，industry，construction and transportation industries are discussed.