The paper proposes a new three dimensional computational model in creep simulation of wall rock of salt caverns according to the current drawbacks that the computational grid is too idealized and unaware to adopt advantage of the real detection data. The three dimensional strata model is constructed by a well organized HalfEdge data structure

which integrates the study area boundaries

DEM (digital element model) and drilling data. Based on the sonar detection data of salt caverns

the three dimensional surface model of the salt caverns is constructed; and the topological inspection and correction operations to the model are carried out. To obtain three dimensional surface model of wall rock of salt caverns

Boolean operations between the three dimensional strata model and the three dimensional surface model of salt caverns are executed. The computational model of numerical simulation is generated by executing the mesh generation operation to the three dimensional surface model of wall rock of salt caverns. The three dimensional computational model obtained by this method advantages in providing effective computational mesh for post creep numerical simulation process of wall rock of salt caverns; and it is a scientific basis and technological support for the construction and reasonable utilization of the salt caverns particularly.