This paper carries on the comparison and applicability analysis of several structure forms atmospheric dry cabin.Demonstrates the structure selection of dry cabin for submarine pipeline modification without shut-down of Hua De pipeline rerouted project.And select the appropriate size of dry cabin according to each function.Through calculation and analysis, validate structure strength and stability reliability of the gravity atmospheric dry cabin in the state.The success of gravity atmospheric dry cabin design and application opens up a new method of pipeline construction in atmospheric dry environment.