To solve the problem of the balance between performance and energy efficiency on real-time control and industry-oriented wireless sensor networks, we propose a quantitative evaluation and optimal design scheme of energy efficiency model. Firstly, by introducing the feedback control theory, we construct an evaluation method of energy efficiency model under the QoS constraint using an analytic hierarchy process and compute service usability using comprehensive quantitative metric weights based on weighted sum. Then, based on this, we provide an optimization model based on a utility function and design a multi-metric optimization algorithm. The simulation results show that this method can adjust and optimize the network protocol, satisfy QoS constraint under the condition of limited energy, ensure reliable data transmission, reduce energy consumption and prolong network life-time.