分析了地球磁场g01项的变化规律及其影响因素 ,发现g01的变化是地球磁场与外核流体径向运动相互耦合的结果 .在任一时刻g01的变化不仅与外核流体的径向运动方式相关 ,而且还与地球磁场自身的值相关 .当g01s02 的值相对于其它项较小时 ,g01遵循线性变化 ;而当g01s02 的值相对较大时 ,g01则服从指数变化 .在临界状态 ,由于非偶极子服从高斯分布 ,下一时刻g01是增生还是衰减也将是一个随机过程 . The variation law of g01 term and its influencing factors are analyzed and it is found that the variation of g01 is the result of the mutual coupling between the earth's magnetic field and the radial movement of the outer core fluid.On any time, the change of g01 is not only related to the radial movement of the outer core fluid , But also related to the value of the Earth's own magnetic field.When the value of g01s02 relative to other items is smaller, g01 follows a linear change, while when the value of g01s02 is relatively large, g01 obeys the index change.In the critical state, According to the Gaussian distribution of the pole, the next moment g01 is proliferation or decay will also be a random process.