Based upon the micromagnetic theory,an equivalent model has been established to include the effect of the uniaxial stress. The effects of the stress with different strength on the magnetic properties (like magnetic moments、remanence and coercivity) of the amorphous magnetoelastic films of FeCoSiB with the thickness of 30 nm were investigated theoretically by the micromagnetic software OOMMF which was developed at the national institute of standards and technology(NIST).The results show that the magnetic moments distribution were varied with different stresses;when the direction of the stresses was parellel to the external magnetic field，the coercivity and remanence of the film cells were increased linearly with the tensile stresses increase,while decreased linearly with the compressive stresses increase.