Abstract: The resource data storage in distributed Broad-band-service on Demand (BOD) systems is studied quantitatively. Firstly, a suitability resource placement algorithm is presented to balance the system load and to improve the system throughput. Secondly, an algorithm of replication placement policy is proposed depending on prognosticate mechanism. Applications in BOD systems approve that the algorithm can make the better access succession rate and system performance than using some other algorithms.