Live fire load is an important parameter for performance oriented fire safety design of a building. While its investigations have been carried out on residential and commercial buildings and so on, little effort has been paid for the rational treatment of fire load in distribution facilities which have been recently increasing in both numbers and size. Many contemporary distribution facilities are built normally with long-span steel or concrete-filled-tubular structure and there is general demand to remove smoke extraction from the "storage" like large compartments partly for significantly low population density in such facilities. In this report, a methodology of measurement and prediction of fire load in large distribution facilities is developed and applied to large central post office buildings. This method is essentially to reproduce the time history of fire load by taking the transfer of post packages from room to room and into and from the building. Recommended live fire load fbr fire safety design, 351MJ/m^2 is finally determined by taking the fire load covering its 95% on a busy day.
