To meet the needs of embedded application

this paper describes NRS FPU（Northwestern Polytechnical University RISC System′s Floating Point Unit）thoroughly.Our discussions in this paper centre on NRS FPU system architecture

basic arithmetic operation and transcendental function operation algorithms.NRS FPU is designed by a very popular way —— TOP DOWN and with RISC idea.Since add and shift are two basic operations in arithmetic circuits

many algorithms based on them are conceived to implement complex arithmetic functions in this paper.Finally

it is shown that NRS FPU is much suitable for embedded application due to its small area and high speed from its layout.