Fiber metal laminates are functional and structural composite materials. The major advantage of these materials is a combination of low weight and high mechanical strength, which is crucial for the modern aerospace and automotive industries. This paper mainly introduces the modeling and simulating method of the flexible medium forming process of fiber metal laminates. Subroutines have been developed for the input of interlayer prepreg material parameters and definitions of damage evolution and failure criteria. A thin layer of resin was set between the metal layer and the prepreg layer. And a cohesive zone model to characterize the adhesion between the layers through which the interlayer failure process can be obtained. In respect of flexible media forming, the setting and optimization of boundary conditions have been discussed in detail. Finally, through experimental verification, the numerical simulation results can effectively predict defects such as wrinkling, cracking, and delamination of the laminates.