The constitutive model of shaped charge liner material had a great influence on EFP numerical simulation. In order to complete the design of a truncated spherical EFP, J-C and Steinberg constitutive model were adopted as red copper shaped charge liner material models, then the forming and penetration comparison calculation of truncated spherical shaped charge liner EFP with 110 mm caliber were developed based on Autodyn. The results showed that the overall deformation of J-C and Steinberg constitutive model were consistent during the EFP forming process, but the projectile tail corresponding to the latter had large fracture from main body and the material appeared strain over 3. OE +7, which didn't conform to physical facts. In penetrate steel targe simulation, the difference of maximum penetration depth between two methods was small. In conclusion, J-C constitutive model was suggested in simulation of truncated spherical EFP forming and penetration.