Two kinds of magnetic tuning methods to fiber Bragg gratting have been proposed.One is based on magnetic field composed of two programmable magnetic coils,and the other is based on the magnetic field composed of a programmable magnetic coil and a stable magnet.The wavelength tuning properties of two magnetic fields are studied by theory and experiment.The results shown that the linearity of the second method is better than the first one,but the sensitivity of the first method is better.