Abstract: Aiming at the problem that the traditional metal springs is liable to fail in service, a new type of spring-magnetic spring based on the interaction between magnets was studied, it was found that the magnetic spring is a variable-stiffness spring via the analysis of the relationship between the amount of compression and force. The concept of "stable state" was introduced to classify different types of magnetic springs, the mechanical model of monostable, bistablestate magnetic springs were established individually. Effects of stable state of magnetic springs and magnet structure parameters on stable state wereanalyzed by simulation and experiment. The results show that the structural parameters of the magnet such as diameter difference or thickness difference between two magnets have an important impact on the stable state of the magnetic spring.