Electromagnetic control roll (ECR) is a new roll gap shape control technology of strip rolling mill with the high bearing rigidity and strong controlling flexibility. The thermal-force driving performance of ECR is highly correlated with the internal control mechanisms. To explore the variation law of thermal-force driving performance, a numerical simulation is carried out to investigate the influence of the internal control mechanism by the structural parameters such as contact zone, induction zone and induction coil. In this paper, the intensity and distribution of heat source, the heat input of the contact zone, the heat transfer effect between the contact zone and the induction zone, and bulging driving ability are compared and analyzed, and the effect laws of different structural proportional coefficients are discussed. The results show that improving the intensity and distribution of the heat source and the heat transfer effect in the contact and induction zones can be achieved by adjusting the electromagnetic stick type, the induction zone parameters, and the coil parameters, while the bulging driving ability can be directly affected by changing the parameters of the contact zone. The structural parameters’ influence on the internal control mechanism is nearly linear, and the parameters have weak coupling. A comprehensive influence model can be established for different types of electromagnetic sticks, and can provide a basis for predicting ECR’s thermal-force driving performance.