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Wireless technology is regarded as a paradigm shifter in the process industry. In this paper, we study the IWNS for process automation, and design the CR-wFieldNet based control system for process automation with three-layer-network architecture, including the network in the field, the backbone network and the intermediate access network. Following that, we detailed key technologies, including diversified frequency rolling scheme, cooperative sensing and distributing frequency, to improve performance in CR-wFieldNet. Performance benefits of the system is presented at last.