Cloud　radio　access　network　(C-RAN)　opens　up　new　opportunities　to　have　a　better　resource　management　of　mobile　network　on　the　basis　of　centralized　processing.　The　fronthaul,　which　transfers　signals　between　baseband　units　(BBUs)　and　remote　radio　units　(RRUs),　is　confronted　with　bandwidth　allocation　problem　when　multimedia　multicast　technique　is　introduced.　In　this　paper,　we　propose　an　algorithm　using　integer　non-linear　programming　(INLP)　model　to　improve　the　bandwidth　allocation　efficiency　of　fronthaul　considering　of　information　sharing　in　multicast.　Good　results　can　be　achieved　in　the　numerical　simulations.　©　2016　IEEE.