In order to study the springback characteristics of braided spring in high temperature baseline seal,a parametric model of braided spring tube was established by Pierce coil model.The static simulation of braided spring tube was carried out by using finite element software.Compared with the experimental data,the simulation results are in good agreement with the experimental results when the friction coefficient of the contact surface is 0.1.Spring stiffness is very sensitive to line diameter,and the relationship between spring resilience and line diameter is non-linear and high-order.Increasing the number of strands of braided yarn will multiply the spring stiffness.The influence of temperature on spring stiffness is small when it is lower than 600 ℃.When it is higher than 600 ℃,spring stiffness decreases rapidly with the increase of temperature.The minimum fatigue life of braided spring tube calculated by S-N curve is higher than that of sealing design at 650 ℃.According to the design requirement of baseline seal,it is recommended to use the parameters of ring density LD=0.05,line diameter 0.32 mm and double-wire braiding to make braided spring tube.