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Objective In the surgery of calcaneal fracture, whether the sustentaculum tali screw should always be placed is widely controversial.The aim of this study is to explore the necessity and function of the sustentaculum tali screw placement for the treatment of Sanders type Ⅱ calcaneal fracture.Methods The finite element analysis was used in this study.After the establishment of the finite element model of Sanders type Ⅱ calcaneal fracture, the two internal fixation simulations were designed.In one model, the AO calcaneal plate was simulated on the lateral side of the calcanues with 7 screws being fixated at different position of the plate, In the other model, the calcaneus was fixated with the same AO calcaneal plate together with an additional screw being infiltrated into the sustentaculum tali.The two models were simulated under the same loading and the displacement of the fracture line and the stress distribution in the two models were calculated respectively.