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In this paper, the influence of the magnetostriction effect on the formation of the stripe domain is studied by micromagnetic simulations. The microstructures and local stress are carefully investigated in soft-magnetic thin films with a thickness from 2 to 256 nm. The domain structures, as well as the M-H loops, of these thin films are calculated by applying the in-plane periodic boundary conditions. It is found that a critical angle φ0 , which is the minimum angle between the magnetoelastic fields Hms in neighbor stripes, exists for the formation of the stripe domains in a thin film. Furthermore, φ0 depends on the maximum angle between the Hms and the boundary line of neighbor stripes. The second-order derivative of the vertical component of the magnetic stray field which corresponding to the magnetic force microscope signal is also simulated. The M-H loop is calculated in a large thin film with an assumption that the stripe domains are isotropic in-plane. The shapes of these hysteresis loops can also be an indicator of the stripe-domain configuration.