As the performances of the processing equipment of such networks as WLAN are affected when the Network Address Translation（NAT） function is enabled

this paper studies its realization in OCTEON chips.On the basis of analyzing the acceleration properties of OCTEON chip hardware

this paper introduces the software design framework with separated data and control planes and discusses the special task scheduling mechanism for the chip and presents an OCTEON chip-based NAT function implementation scheme.The experimental results indicate that this program greatly improves the NAT transition performance and has a good practicability.