Abstract: Based on the 11th international geomagnetic reference field (IGRF11) model, the gradient distribution characteristics of the geomagnetic field in the near-Earth space are analyzed. From magnetics, it is known that the spacecraft with a strong magnet moment is not only affected by the magnetic moment, but also by a magnetic force related to the geomagnetic gradient. This paper discusses how to change the orbital inclination angle by the weak magnetic force, based on the force analysis for a magnet interaction with the geomagnetic field in the IGRF11 model. Numerical simulations are carried out to test the effectiveness of this idea.