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DVB-S2 is used as the most popular standard for satellite communications for its efficient BICM structure and outstanding error performance. And the interleaver of DVB-S2 is a simple model with rows-reading columns-writing, wich is convenient for implementation. However, the error performance would be affected by the multi-edge modulated symbols, which can not be eliminated by the original simple interleaver. So in this paper, we focus on the impact of multi-edge LDPC symbols on the performance of the DVB-S2 system, and propose an improved interleaving scheme to prevent the performance degradation caused by the multi-edge modulated symbols. The new interleaving shceme can improve the decoding performance of DVB-S2 BICM system with a little extra computational complexity compared with the original interleaver. Simulation results show that the DVB-S2 BICM system with our proposed interleaver outperforms the traditional system in different code lengths, rates, modulations and channels.