Based on the force effect of static magnet interacting with the Earth's magnetic field, Magnetic Propulsion, a new propulsion technique for low-Earth orbit (LEO) spacecrafts which need not to consume propellant is proposed. This method has the distinct advantages of explicit mechanism, simple physical structure and flexible control strategy, etc. Based on the principle of magnetic moment's interacting with magnetic field, a way for altitude maintenance is proposed by tracing the earth's magnetic field lines, and the orbital dynamics model is built. Then through numerical simulation in IGRF11, the results confirm that the magnetic propulsion technique can maintain small spacecraft's orbital altitude in 600~1000 km's circular orbits.
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