Aiming at the problem of robust transmission in Distributed Video Coding(DVC) system, a DVC system transmission framework based on layer restoration is designed. Firstly, this transmission framework uses the High Efficiency Video Coding(HEVC) frame encoding and Wyner-Ziv coding to encode Key frames(K frames) respectively, and the checking information(Wyner-Ziv codes) is stored in the cache as a layer repair code stream. If the current Key frame is lost, the corresponding layer repair code stream of the frame is requested at the encoding end, and the error block is repaired at the decoder end to obtain the improvement of Key frame decoding quality. At the same time, the algorithm of layer repair coding rate estimation is also studied and the successfully decoded bit plane is employed to complete the algorithm reconstruction. The experimental results show that the transmission framework takes advantage of layer repair code stream of Key frame to repair the distortion part of Key frame. The qualities of Key frame and side information are improved(for example, when the "Kendo" sequence is lost by 5%, the Peak Signal-to-Noise Ratio(PSNR) is increased by 3.5 dB at the bit rate of 1 000 kbps), so as to realize the robust transmission of distributed video coding system.