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Ferromagnetic materials have magneto-elastic effect when the materials was be magnetized. This characteristics using in cable tension measurement, which has a lot of merits contrasted with the method of vibration frequency and strain gages, its frequency of dynamic response is high, its life-span is long and its capacity of protecting over-loading is strong etc. so it is the most ideal methods. But the theory and model of magneto-elastic effect is not perfect, there are some problems to be researched and overcome. Such as dynamic hysteretic model, influence factors of magneto-elastic effect and so on. In this article, the dynamic hysteretic model is established based on energy conservation, analyze the main influence factors of model, which include bias magnetic field and excitation mode, excitation frequency, temperature influence. And simulate the results of that influence parameter, and it indicates that those influences are greatness, we must select rational excitation mode and frequency, and must overcome the temperature influence, the magneto-elastic effect will be widely using in cable tension measurement of bridge.

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