The interfacial fracture energy G, which includes the effect of residual stress, was deduced for Ni films on titanium and stainless steel substrates based on the energy-balance argument and the numerical method for the work expenditure Gdb of Moidu et al. The estimated interfacial fracture energies G are independent of the film thickness, the peel angle and the residual stress. The value of G for Ni films on a stainless steel substrate is about 5.47～6.08N/m for various peel angles θ, while 5.33～6.72N/m for Ni films on titanium substrate with various film thickness h. The effect of the residual stress on the peel strength P/b was also discussed.