Energy conservation has always been crucial issues faced by the development of academia and the automotive industry. Traditional cellular networks cannot meet people's needs for video, large files and entertainment. To tackle these problems, cooperatively vehicles-to-everything (V2X) downloading is a typical solution of driving experience, which is in line with the trend of automobile development. Cooperative downloading can better achieve energy efficiency, low-emission and resource sharing. Using cooperative vehicles to download files for intelligent transport systems (ITS) is attracting increasing attention. The future commercial potential is unlimited and a win-win situation is achieved. One of the key challenges in building cooperative downloading today is the provisioning of multimedia services requiring actuator algorithm, intermittent connectivity and real-time computation. This survey summarises recent efforts of the key technologies, routing protocols and incentives mechanism in cooperative downloading.