Heat exchanger network is one of the major technique of energy conservation. This article synthesizes the heat exchange network, through adjusting the bypass of the heat exchanger, the flexibility of the heat exchange network and the redundancy of the control system can be effectively improved, which is conducive to forming a closed-loop control of the final heat exchange temperature, thereby improving the quality of the heat exchange network and the stability of the system. The matching relationship is selected effectively through the qualitative analysis of operating characteristics and coupling relationship of control loops, which reduces the coupling degree between the control loops effectively in the engineering design stage. The concepts and discrimination methods of resonance coupling are proposed, the design process of control loop variable matching is optimized, and the selection and matching rules of adjusting variables are supplemented and perfected.