To reduce the hysteresis of spin valve films is important for fabricating Giant Magnetoresistance(GMR) sensors. This paper reports the experiment results of reducing hysteresis of the spin valve films by using an annealing method and describes numerically simulating annealing conditions and methods. By utilizing the method of numerical simulating

the annealing conditions and experiment results are simulated. The simulating results show that the numerical simulating can not only optimize annealing conditions

but also decrease a large numbers annealing experiments. Using optimized annealing conditions

the coercive force of the spin-valve film is reduced enormously but the Magnetoresistance(

MR

) of the spin-valve film can be kept a higher level. An annealing experiment and different annealing parameters show that the coercive force and

MR

of the spin-valve film respectively is 358.2 A/m and 9.24% before annealing

but they have increased to 3.18 A/m and 8.54% after annealings

which proves the numerical simulating method is conductive to the improvement of the annealing conditions.