Abstract Objective To study the effect of different anatomical reconstruction methods of lateral ankle ligament on ankle joint stability by finite element analysis. Methods Three-dimensional CT data of ankle joint of a 32-year-old healthy male volunteer were selected to construct a solid skeleton model. Normal control model, single ligament reconstruction model, Y-shaped reconstruction model and double tunnel reconstruction model were designed. Mesh and define mechanical properties and contact relationship of materials. Ankle neutral position, plantar flexion 20 and dorsal extension 10 were added 150N to simulate the anterior drawer test and 1.7N ·m internal rotation torque to simulate calcaneal varus test. Results (1) The Von Mises stress of anterior drawer load, neutral position and 20° metatarsal flexion from anterior fibular ligament was not statistically significant (P>0.05). The Von Mises stress of single ligament reconstruction model and double tunnel reconstruction model at 10° dorsiflexion was significantly less than that of control model and y-shape reconstruction model (P<0.05). (2) Under inverted load,There was no significant difference between Von Mises stress double tunnel reconstruction model, Y-shaped reconstruction model and control model (P > 0.05).There was no significant difference between the Y-shaped reconstruction model and the control model (P > 0.05) at 10 degrees of back extension, which was larger than that of the double tunnel model (P < 0.05). (3) the talus inclination of the single ligament reconstruction models at neutral position, 20 plantar flexion and 10 dorsal extension was greater than that of the other three models (P < 0.01).Conclusion The stability of double tunnel and Y-shaped reconstruction of lateral ankle complex is better than that of single anterior talofibular ligament reconstruction , and Y-shaped reconstruction is better than double tunnel reconstruction as a functional and anatomical reconstruction.