The biomechanism of common ankle injury involves three stress vectors in ankle. Focusing stability of ankle joint is the key of treating ankle injury. Sprain, contusion, and fracture of ankle all need to take into the correlation between fixation and mobility. Case Report: A 64-year-old male had the right ankle fracture due to traffic accident. He was received a simpling fixation of right ankle, and his restoration was smooth. Discussion: According to the fixation with biomechanical principle and the plan of early functional training with support, we should free choose methods and materials of fixation. We applied the treatment mode of ankle fracture to acute ankle injury and the result showed the efficacy of early enhancing support of the ankle joint. Conclusion: It is worth further study that the simpling fixation can be applied to patients with sprain, contusion or linear fracture suspected of ankle or other joints having contraindication of active moving and having to be fixed.