Abstract—In this paper, we analyzed the impact of the hardware impairments at the relay node in amplifying and forwarding based cooperative networks. Especially, the accurate expression for the outage probability is proven with respect to the level of hardware impairments for Rayleigh fading channels. Moreover, we uate the system’s performance in term of the throughput which depends on the antenna noise, transmission rate and the source’s transmission power. Finally, the Monte-Carlo simulation’s result verifies the analysis in order to propose system’s design with the acceptable impairment of hardware in physical which can ensure the communication’s quality.-Abstract—In this paper, we analyzed the impact of the hardware impairments at the relay node in amplifying and forwarding based cooperative networks. Especially, the accurate expression for the outage probability is proven with respect to the level of hardware impairments for Rayleigh fading channels. Moreover, we　uate the system’s performance in term of the throughput which depends on the antenna noise, transmission rate and the source’s transmission power. Finally, the Monte-Carlo simulation’s result verifies the analysis in order to propose system’s design with the acceptable impairment of hardware in physical which can ensure the communication’s quality.