Abstract: The real-time delivery of multimedia data over wireless links with QoS-Guarantee is a big challenge due to the unreliable and dynamic characteristics of wireless networks，limited bandwidth and high QoS requirements for multimedia applications.In this paper，an adaptive link-level Forward Error Correction（FEC） algorithm for wireless media streaming is proposed，in the hope that the media can be played on receivers with high quality.The algorithm，based on cross-layer optimization design，predicts the packet loss rate using the Kalman filter，and adjusts the FEC parameter N as well as predicts the number of frames of a GOP.On the other hand an adaptive FEC is used at the application layer to adjust the sending rate of MPEG video frame adaptively and to allocate the network bandwidth resource between the MPEG video source data and the redundant data dynamically.Both the mathematical analysis and NS simulation demonstrate that the proposed mechanism can significantly improve quality of media streaming，in terms of playable frame rate，reliability and real-time performance on the receiving side.