Fixed orthodontic technique is the most effective method for the treatment of canine crossbite. The purpose of space reservation and tooth retraction in crossbite treatment is mainly achieved through the orthodontic force released by the orthodontic archwire. Among the tooth crossbite, the canine crossbite is the most common deformities of teeth. The combination of herringbone and T-shaped loop is often used to close the maxillary dental space. This article aims to quantify the release of orthodontic force by herringbone and T-shaped combination before orthodontic treatment. It can provide a theoretical reference for orthodontists in the treatment of crossbite. The deformation process of herringbone and T-shaped composite curve is analyzed, and the deformation process is divided into elastic deformation and elastoplastic deformation. The differential equations of the orthodontic force under the two kinds of deformation are established, and the released orthodontic force is divided into two kinds, including retraction force and overturning force. The theoretical model of herringbone and T-shaped combined loop is established. Secondly, the error rate of the finite element simulation data and the theoretical value are calculated, and the error rate between the simulated and theoretical values of the retraction correction force is 0. 43% ~ 8. 33% , and the error rate between the simulated and theoretical values of the overturning correction force is 2. 13% ~ 9. 76% . The experimental measurement platform is established. The error rate between the experimental and theoretical values of the retraction force is 0% ~ 9. 30% , and the error rate between the experimental and theoretical values of the overturning force is 0% ~ 9. 76% . The experimental measured data showed the same nonlinear variation trend with the theoretical values, which verified the correctness of the theoretical prediction model of the herringbone and T-shaped combination loop. This model can help physicians to conduct a detailed quantitative analysis of orthodontic force before treatment to provide a basis for the formulation of personalized treatment plans and better meet the needs of patients.