Abstract: Built on recently presented optimized batch patching (OBP), two dynamic caching strategies for media suffix named IC-BP and PA-BP are proposed in this paper to alleviate the over-consumption of backbone bandwidth and the server load in media streaming systems. Here derived are the required average backbone bandwidth, the average server channels used and the maximum cache capacity of the respective scheme when dealing with a unique media object. By defining a simple but practical cost function, the aggregate delivery cost of the two schemes that tradeoff the network and server resource are discussed. The results show that both schemes can greatly reduce the backbone bandwidth consumption and the server load, while PA-BP outperforms IC-BP with much lower cost since it saved more patch traffic by using an additional buffer to pre-buffer the incoming data in case requests arrive in the current batch interval and therefore more transmission cost is saved than IC-BP.