The rapid growth of the number of Internet users makes the visiting requirements of streaming media continue to increase, the huge demand for streaming media access and the limited ability of servers to distribute streaming media cause some problems, such as slow system response and the decrease of user experience. To solve these problems and apply the solution to the New Media Broadcasting the CDN system based on cloud computing is proposed, it mainly uses cloud computing and CDN to enable the users to access the nearest required resource, to ensure the quality while it increases the distribution speed of streaming media and reduce costs to improve user experience. This paper mainly describs the structure and major functions of the CDN system based on cloud computing for New Media Broadcasting, specifically introduces the client speed measurement technology by means of Hadoop and a caching technology based on user behavior.