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Metal-plastic sandwich sheet consists of two layers of metallic sheet as skin and a polymeric material as core.Three layers are glued together.The interface stress between skin sheet and core layer have a large influence on the deformation behaviour of sandwich sheet.This present study mainly focus on investigating the effects of interfacial adhesion strength between skin sheet and core polymer on the formability of AA5052/polyethylene/AA5052 sandwich sheets.A numerical simulation model considering the interface conditions between skin sheet and core materials is developed for simulating the forming process of sandwich sheet.Comparisons between experimental results and calculations verify the proposed model.Then, the rigid punch tests and the Nakazima forming tests are carried out for three sandwich sheets with three kinds of interface conditions (separation, adhesion and stick).The influences of interfacial adhesion strength on the damage behaviour of skin sheet and the forming limit diagrams of sandwich sheets are investigated.Research results show that the interface stress can postpone the fracture of skin sheet.The FLD of sandwich shifts to higher value with the increase of interfacial adhesion strength.