:To present a streaming media secure communication method based on dynamic key of two hyper-cha-otic systems and RSA(combined by three initial letters of family name in three people Rivest，Shamir and Adle-man ) encryption algorithm. The chaotic system parameters and iterative parameters of chaotic system serve as dy-namic parameters in this method. Parameter values meeting some conditions are randomly generated for every com-munication. And two parties in communications use the RSAalgorithm to exchange secure parameters. Make surethat the parameters are used only by the specified receiver. The keys are combined by chaotic sequences generatedby two hyper-chaotic chaotic systems，making the key space larger. Tosatisfy the meet of real time in streamingmedia transmission，an improved generation method of key sequence is presented to increase the encryption speed.The software written by C language is run to make a test in the LAN. It shows that the proposed method meets notonly the safety of streaming media communication but also the need of real time.