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The rapid development of computer network has greatly popularized online education. Currently, most online education systems are using a learning platform of three-split screen courseware, in which stream media take up a majority of resources in bandwidth and storage space. Due to more and more students receiving online education, the load of stream media service is getting heavier, so that the traditional centralized architecture and image architecture cannot satisfy the access requirements of a large number of nationwide students. Therefore, a highly practicable stream media application architecture with quick response and high concurrency, reliability, stability, extend ability. This paper first discusses the development of online education as well as the problem, then deeply explores the key technology to realize distributed architecture of stream media according to characteristics of online education, with the introduction of P2P and CDN architecture, along with stream media subdivision technology.