The space membrane structure can be deployed by gas. Compared with the mechanical deploying method， the inflatable deployment of space membrane structure has simple deployed mechanism， the low launch cost， and the small volume. And it can be applied to the deployment of space flexible structures， the off-orbit of abandoned satellites and many other fields. Aiming at the inflated method of the space membrane structure， we establish a model in LS-PREPOST and set four working conditions. One of the working conditions is selected as the standard inflated situation， and then the K file of the model is imported into the LS-DYNA solver. By changing the inflated rate， temperature and pressure to simulate and analyze the deployed process of the structure， it can be obtained that when the temperature of the inflated gas is changed to 750 K， the deployed process is relatively stable， the deployed effect is good， and it is more suitable for practical applications.